Electrical Problems with 90 f250 7.4 litre

[sbbeachboy]

I bought a 90 f250 lariat recently and when I bought it everything seemed to be allright. But now my rear turn signals are both flashing no matter which turn signal I use. The front ones are fine though, but now sometimes when I flip them on they stop. I have replaced the flasher fuse, but it still happens. Any suggestions?

 

[Seabronc]

It has nothing to do with the flasher, the same flasher element is in use for both. The only thing I can see is that there must be a short between the two wires, Orange with a light blue stripe (left hand light) and light green with a orange stripe (right hand light). The attached is from a 1983 EVTM but the circuit is the same with the exception of connector designations.

Good luck,

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