Brake light Fault

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Sounds a lot. Pretty sure it is just a 12V bulb. I think I checked once when I was doing something with the trailer electrics but don't remember anything that high.

Do you have a copy of RAVE?
 
Interesting I have checked green/black wire in trailer cubby hole and that shows 18 volts when brake pedal depressed?



Your multimeter is broken. Brake lamp wires are Green/Purple tracer.:D
 
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It is, of course, possible to make 18v from a 12v battery using a buck converter but I can see no reason why they would so therefore concur with wammers that your multimeter is forqued!
 
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