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Electric problems

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I have a small problem, when I turn my lights on the battery indicator drops and the temp gauge goes into the red.

I have checked the alternator output at 2540 rpm and it shows 14.51 volts.

 Every thing else works fine.

Any ideas please.


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Perhaps an earthing fault, somehow the lights are earthing through the temp gauge ?



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I just had a look at the wiring diagram on the internet -   arrrggghhhhh.  


I would go for an earth fault.  The lights take a fair bit of current. If there is a resistance in its power supply then it will drag its volts down.

If the temp gauge is on the same supply then it will also lose volts.



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