On my 1966 convertible, when I turn on my indicator for a right turn, both taillights blink. However, when I turn on the indicator for a left turn the front indicator light and rear taillight operates normally. What would cause both the tail lights to blink when I indicate a right turn???? I've checked everything I know to check with no results.

 

Here is a schematic of a typical Mustang turn signal system. It appears that yu may have a bad assembly that shorts the flashers to the turn switch

 

bop11
Thanks for the reply but I can't get the link for the schematic to open for me. I've tried it numerous times but it always says "This file can't be downloaded".

 

Turn signal schematic<br/>

 

Thanks for the schematic. I got it this time and checking things out. Haven't found any problem yet. Thanks again.

 

Did this problem just start? New owner?

 

No, not a new owner. I've owned my Mustang for 36 years and this turn signal problem just started recently. I still have not been able to correct the problem. I've checked the wiring, installed new bulbs and done everything I know but without success. Both tail lights still blink when I signal a right turn. Any suggestions would certainly be appreciated.

 

Have you checked the turn signal switch?

 

That would be my next thought too - other than that.. maybe a short in the wiring harness that runs from the front to the back? Might be able to check that with a Multi-meter.

If that's the original turn signal switch, personally - I'd just replace it before I starting digging in much more..

 

No need to throw parts at it. Just unplug it under the dash and poke it with a multimeter to see where it's sending power.

http://www.midlife66.com/wiring/wiring.html