A Quick Fault Finding Tip…

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Sometimes things you take for granted and have in your toolbox of fault-finding tricks are a dark art to others.

I was talking someone through a bit of fault-finding on their vehicle and asked if they had measured the current in the circuit. “No” came back the answer. I asked what type of fuse and rating it was and asked the person to just put their voltmeter across the fuse and tell me the voltage across the fuse. “Ah… that’s about 3.2 amps then” I said.

“How do you know that?”

Simple really – all fuses have a resistance and if you know that you can work out the current from the voltage drop. Even simpler really – there are tables for various fuses that have it all worked out for you. I have a selection collected over the years stuffed into the lid of my tool box, along with a lot of other junk paperwork!

I created a volt drop table based on PEC (Pacific Engineering Corporation) fuses that are supplied as OEM fuses in most Japanese, Korean and European vehicles however it is pretty accurate for almost all other makes of the same type of fuse. I printed mine out, laminated them and added them to the collection in the top of my toolbox.

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It’s quite easy to use. Just set your multimeter to read DC mV and read the voltage displayed. Now select the fuse type, in this case an ATO fuse – the most common used in vehicles, caravans and motorhomes and from the chart look down the left column until you see the voltage measurement that matches the one on your multimeter… lets say 0.011 volts (11mV)

The fuse is a red 10 Amp fuse so follow the 0.011 volt line across until you get to the 10 Amp fuse column and read the current figure… in this case 1.3547 or 1.3 Amps. It’s as easy as that, no need to break the circuit to put your multimeter in as an Ammeter.

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I have a couple of these cheap handy plug-in ammeter’s…  although they do have limitations and only work up to 20 Amps.

Although the table is based on PEC ATO/ATC and MINI fuses (download info below) it is pretty close with most manufacturers fuses and as a general reference for fault-finding will be good enough to 0.1 amp.

If you need to know the actual current through a circuit, you need to use an ammeter and not rely on tables but for general work they are close enough.

These tables also come in handy if you are trying to find out why a battery is draining. Without turning anything on it is easy to run through a fusebox checking to see if any circuits have a current drain on them without having to constantly pull fuses and insert an ammeter, which sometimes can upset or reset the circuit you are working on.

One thing to remember with this test if you’re tracing a fault, is you are only measuring the volt drop across the fuse to determine current. You really need to know how much current you should be drawing. For example, If I was testing the 12 volt fridge circuit fuse and I only got a voltage drop across the fuse that calculates to 6 Amps then I’d know there was an issue somewhere along the circuit as I’d be expecting around 10 Amps or more.

A word from our Safety Officer…

"Oscar" our senior safety cat.

Oscar would like to remind you that working on a live circuit has risks and never attempt to undertake volt drop measurements on mains circuits. Most cheap multimeters do not have the internal protection or fused test leads. Be safe. Be like Oscar.

You can down load the table in PDF format (4 pages) and either print them out or save them to your device from the following link: Fuse Voltage Drop Table

Unfortunately due to a lot of my drawings and text being used elsewhere without credit back to CaravanChronicles.com  I’ve had to start putting watermarks on a lot of things. I hope this doesn’t make the table too difficult to read.

P.S. Someone told me that everything on the internet can be improved by cats and my “likes” would go through the roof!

 

A Grande Day Out…

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Right, I’m not known for caravan reviews… why?  Well those YouTube types always beat me to it… and how the heck they can shoot, edit and publish so quickly is a skill that I still consider voo doo, mind you, pilots aren’t required to have the knowledge of joined up writing let alone mastery of a keyboard. (A cursory nod to Dave Gunson… one of the finest controllers to ever say “Descend and maintain….”)

Onwards…

04:30… alarm chirps…. I had been invited by Bailey of Bristol to their launch of the Pegasus Grande and this meant a bit of an early start. By 05:15 the Amarok was idling warming up and the Sat Nav silently contemplating my route down to Swindon, while I  finished making a coffee in the Camelback insulated mug, cleaned the heavy dew off the windows and threw my day bag into the truck. Unfortunately it was going to be a solo trip. Continue reading

TPMS Revisited…

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Its been quite a while since I did my first review of a TPMS (Tyre Pressure Monitoring System) back in September 2015 in fact, on a Tyre Pal system sent to me for review. I did like it but it did give me a few things to think about. Later on I got to test out the Fit2Go TPMS and I ran with that for about 12 months. However I still wasn’t convinced this was the one for me.

With the Tyre Pal I did like the information, but on a screen that size I would have liked to be able to see all the pressures and temps altogether rather than scrolling through each wheel. Although it did cross my mind at the time “do I really need all this info” and that’s why I liked the Fit2Go unit. It sat there quietly monitoring the wheels and just occasionally flashed at me to say everything was OK…. or beeped if there was something wrong. I did eventually miss not being able to see the pressure and temp of each wheel and started to think my earlier statement was flawed.

I had an issue with the Fit2Go unit at around nine months of using it. The batteries in one of the wheel sensors failed… and a couple of weeks later a second battery went down. This was a bit of an issue as the sensors on this unit were sealed and the batteries weren’t replaceable (a plus point for the TyrePal here!) Credit to guys at Fit2Go… now re-branded as Michelin – they sent me out a complete new unit and four sensors. I installed the replacement unit and sensors and ran with that for a while.

Going into work at around 04:45 in the morning, I pulled off our drive the unit started beeping, indicating a low pressure tyre. I pulled over and checked the small LED on each sensor… no flashing red indication.  Tyres looked good, checked the pressure with the  Fit2Go hand-held unit and all as they should be. I  carried on. The beeping stopped. A few days later as I had just got onto the motorway it went off again, pulled onto the hard shoulder, checked each sensor and wheel… no flashing LED and all wheels looked OK. I also took the time to check the pressures again, all OK. On the fourth or fifth time this happened I gave up checking. It only seemed to happen with an early morning start and I started to doubt the info I was getting from the unit.

I started looking around for alternatives… mainly in the US for RV TPMS systems as they seemed to have a greater number of options. It wasn’t long after this that I got the e-Trailer unit to test. Which as well as checking the leisure battery voltage, monitoring the fridge temp and a host of other things had TPMS monitoring for your caravan wheels and sent alerts directly to your phone. With this fitted I had at least covered off the important wheels when towing. I just needed something for the truck. Looking around at  what was available on Amazon.Com in the USA made me realise how much we are actually paying in the UK for this stuff. There were units branded for the American market that were identical to those in the UK for a lot less even with the poor exchange rate.

This set me thinking… could a cheap TPMS available in the UK be as good… were we paying too much? I found a unit on Amazon.co.uk for £50 and ordered one. https://amzn.to/2wv49TS

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The unit had a couple of options for mounting. The sensors had replaceable batteries and were pre-coded to the unit. Each was marked with the correct location… FL, FR, RL and RR.

After much procrastination about where to put the display (it’s a man thing) I could not make my mind up so for the time being it sits on top of the steering column….

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IMG_1482IMG_1481In the few weeks since I installed it.. which was really easy,  it’s worked well. I can set the upper and lower limits for pressure and temp for each wheel and it is fairly accurate on pressure. To test it I used my digital tyre gauge fitted to my compressor in the work shop and checked with a standalone digital check gauge I used to use for aircraft tyres. It always matched the same PSI as both my digital gauges showed and as it didn’t decimal point readings on the PSI setting (you can change it to BAR, as well as from C to F for temp) it seemed to round-up from about .6 which seems acceptable to me. (32.4 PSI would be displayed as 32 and 32.6PSI  would be shown as 33)

It comes complete with a small spanner for the lock nuts, a do-hicky for replacing the battery in the sensors and for £50 it seems like reasonable quality. It does what it states on the box, it’s small enough to put almost anywhere (and that’s my problem… where!) and if you have amazing eyesight… it even has a vehicle battery voltage display right in the centre! And if that didn’t clinch the deal… it even alarms when the batteries are low in the sensors.

So was my £50 well spent? Well at the moment I think so. (I reserve the right to change my mind in the future) You know me by now and if I thought it was a jockey wheel with out a handle…. I’d tell you!

So if you don’t yet have TPMS and don’t want to spend a fortune on one this might be a suitable option.  If you want one… go on you know you do, here’s my affiliate* link on Amazon UK – https://amzn.to/2PX6a3a

*It won’t cost you any more but you will get that warm fuzzy feeling knowing Amazon are going to give Caravan Chronicles some of their profit.

Bike Rack Needs a Home…

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Long time readers may recall I customised a bike rack for our Land Rover Freelander 1 to allow us to carry two full frame mountain bikes on the back of our Freelander while towing a caravan and have enough clearance for ferry ramps while towing as well. Big advantage being it didn’t affect our MPG as the bike were effectively out of the airflow both solo and towing.

Well since we bought the VW Amarok the rack hasn’t been used and it has just been hung from the roof of the bat cave since then.

So its time to find it a new home, If you have a Freelander 1 and are looking for a fold up bike rack for two bikes complete with 13 pin fitted trailer board and all the web straps…. make me a silly… but not stupid offer.

I’m based in Manchester but would be happy to meet up part way… I ain’t going to wrap this thing up that’s for sure!

Drop me an email with a silly (not stupid) offer.

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The Green Vally Spare Wheel Mounted 2 Bike Cycle Carrier

 

Something For The Next Caravan?

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When you are starting to look for a replacement… or even your first caravan, you collect ideas. You see something and think “that’s a good idea” and from that point you start judging all other caravans against that ‘thing’ you have in your mind that you think is a good idea. After a while you start to build up a collection of “that’s a good idea” and ‘thing’s’. What your mind builds is a perfect caravan for you and that is what you are endlessly searching for.. your perfect caravan.

Well here is a “that’s a good idea” that is one of a collection for my perfect caravan. If you have ever watched any of the American RV walk rounds one thing that is common to them all is they all have slide outs… heck even some slide outs have slide outs of their own. (I’m waiting for the next super king cab dually pickup truck to have a slide out..!) Nope it’s not a slide out I’m thinking of though.

Continue reading

Summer Catch Up…

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Although it might seem quiet here at the Caravan Chronicles pitch there have been a few things going on behind the scenes so I thought it was time for a catchup and a chat.

A lot of people have been asking why I haven’t done any YouTube videos? Well the simple fact is they are flippin’ hard work…. plus I don’t particularly like being on video. I’m not a ‘presenter’ by any means… (mind you I’m not a writer either but enough people seem to read this blog). I really don’t know how Andrew Ditton, Dan Trudgian and all the others have time to produce the amount of good quality content that they do. Hats off to you guys! Continue reading

Catch Me If You Can… Part 2

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You might want to read Catch Me If You Can… (pt 1) first

After a quick four-day break at the Caravan & Motorhome Club’s site at Wirral Country Park (excellent by the way… already trying to work out when we can go back!!) and a bit of work getting in the way it was time to get going again not he catch can… really it should be called the “Air Oil Separator” Install.

Last time, I’d decided if IKB would have been shaking his head… then it wasn’t right. I decided to make a new bracket out of 1.8mm aluminium sheet and go into full on origami mode. (ps.. after the last post someone emailed me asking what IKB was…. Mr Brunel  was not pleased). Continue reading

Catch Me If You Can…

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I’m installing a “Catch Can” can on our VW Amarok and this little posting is all about it, but first a bit of history on why I’m installing one.

If you look at modern high performance diesel engines one of the things that they do to reduce emissions is have a number of systems to reduce the harmful emissions. EGR or Exhaust Gas Re-circulation wich is feeding part of the engines exhaust back into the intake but probably the most widely known is the DPF… or Diesel Particulate Filter which captures fine soot particles from exiting the exhaust. The DPF needs to be cleaned regularly, through a process called regeneration. Either active, passive or forced, the accumulated soot is burnt off at high temperature (around 600°c) to leave only a residue of ash, effectively renewing or regenerating the filter, ready to take on more pollution from the engine. To regenerate, the vehicle electronics adjust the timing of the engine to increase the exhaust gas temperatures or commonly it can be achieved by passive regeneration usually on the motorway when exhaust gasses are generally hotter. Continue reading

‘Put big light on will yer…’

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I get sent lots of bits by all sorts of people to test and hopefully write about on the blog… and I think you can guess that I don’t write about too many by the lack of ‘reviews’ on here. Basically if it’s not up to scratch I don’t write about it. I don’t want to knock back a product or company because I have a problem with it or them… so I just keep quiet.

However a couple of weeks ago Erin reached out to me (as the Americans are so fond of saying) asking me if I’d like to review a couple of products… they would send them free of charge in exchange for a review. I agreed. Continue reading