Voltage drop on cable-advise required please

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Evo1972

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Interior light not working on 70 westy.

Checked voltage on red wire and only 2.99v.

Checked fuse box and getting 12v each side of fuse.

Any ideas what may be causing the voltage drop?
 
resistance. wire is bad, e.g. has been shorted. or something. or a bad earth

try running a fly wire form the fuse to the holder. and / or a new earth with good continuity
 

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