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Problem: LR turn signal flashes rapidly when headlights are off. LR turn signal flashes normally when headlights are on. Have checked all fuses,ok. Have replaced LR bulbs, new. Can't find any broken wires. Any ideas would sure be nice.
 

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I would guess grounds also, sounds like you have to much resistance with headlights/parking/running lights are off. But when on, they vampire the ground thru another portion of the lighting. (ie: ground thru another bulb)
 
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I've had a unusual experiences with trailer light hookups and blinker/turn signal issues. Without the trailer being plugged in, the dash would light up and blink but would not sound audibly as soon as pushing in the brake pedal. I could alway tell when a bulb wasn't flashing by the dash signal flashing fast........it's usually the back bulb. And, sometimes all was needed was remove and reinstalling the same bulb.......there's a connection thing happening. I've recently read that I need to check the screws that attach the fuse box to the fender wells!.........ill try anything at this point.....and don't get me started with passcodes. I've learned there to not let go of the key until the engine has started.
 
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