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Technical Fuse 1 blows intermittently on year 2000 hymer motorhome

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Technical Fuse 1 blows intermittently on year 2000 hymer motorhome

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BJ the Hymer

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Fuse 1 started blowing 2 years ago, sometimes immediately after ignition, sometimes within a minutes and sometimes with a week or months between it happening. Fuse controls dashboard, indicators and reversing lamp, so engine starts, then when fuse goes I have no fuel, temp or tacho gauges and no indicators. Have cleaned all lighting clusters out and remade connections to a couple of things on the manifold that I'm told may also use Fuse 1.

Can anyone suggest likely cause or a method for investigation please.
 
varesecrazy said:
Poor earth..
Tun a lightweight 2nd cable ;)
Click to expand...

A poor earth connection can cause lots of problems, but I cannot understand how it will cause excessive current and blow the fuse. Please explain.


Cables rubbing against the bodywork at some point, and causing a fault to chassis would seem more likely.
 
Hi

This behaviour normally indicates a chafed wire shorting to grounded metal, or to another wire in a low resistance circuit.


One way to narrow down the fault is to temporarily separately fuse the various circuits coming off Fuse 1, assuming that you can get access to the wiring. Choose individual fuses appropriate for the current drain of each circuit, and wire them in "downstream" of Fuse 1, preferably close to Fuse 1. Wire ended fuseholders with miniature blade fuses are useful for this exercise. I suggest you also temporarily uprate Fuse 1, say about 50% higher than its normal rating.


When/if the fault reoccurs, whichever individual fuse blows will indicate the faulty circuit, which can be checked out in more detail.
 
Anthony489 said:
Hi

This behaviour normally indicates a chafed wire shorting to grounded metal, or to another wire in a low resistance circuit.


One way to narrow down the fault is to temporarily separately fuse the various circuits coming off Fuse 1, assuming that you can get access to the wiring. Choose individual fuses appropriate for the current drain of each circuit, and wire them in "downstream" of Fuse 1, preferably close to Fuse 1. Wire ended fuseholders with miniature blade fuses are useful for this exercise. I suggest you also temporarily uprate Fuse 1, say about 50% higher than its normal rating.


When/if the fault reoccurs, whichever individual fuse blows will indicate the faulty circuit, which can be checked out in more detail.
Click to expand...

May I endorse this post. I was thinking along the same lines.

Without a wiring/circuit diagram, it is difficult to think of any other course to follow.
 
Last edited:
Thanks for those replies, I kind of thought that getting to all the fuse inputs separately was the only way to solve it so thats what I'll look to do. Will post results!
 
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