No turn signals w/ headlights on

[Johnm]

Hey Everyone,

It's been a while since my last post and it's good to be back.

So after doing a staring column rebuild a little over a year ago, I realized it's time to invest in a new turn signal switch. I ordered the part from LMC since I couldnt find one anywhere else and didn't feel like doing a tin of looking. I hooked it up today and everything is great except for the fact that the turn signals don't work when the headlights are one...hmmm. Please help!

Thanks!

[HIO Silver]

Did the turn signals work before the new tss? Double check the color coding vs the pin outs. I had a tss a few years ago that was miswired and had to move the pins around for everything to work properly.

[Mach428]

You didn't mention what year truck you are working on. If memory serves me correctly, I believe starting in 1970, the parking lights stayed on when the headlights were on. You may have the wrong year TSS in your truck. Just something to think about.

[Johnm]

It's a 1969 F250 2WD no p/s with the flasher switch in the glove box. Sorry! I edited my post and left that out of the rewrite. Thanks!

47-0754 is the part number on the new LMC TSS.

The signals have never worked completely. I purchased the truck from a plumming supply company who would "fix" issue their own way. Needless to say there are TON of crap repairs including the TSS. Having said that, I didn't have a lot to go off of when installing the new TSS so I just connected alike colored wires the best I could.

[cep62]

Make sure all your lights are properly grounded.
the turn signals might be grounding through the lights and when you turn them on they can't blink.

[Johnm]

Problem Solved! It was the ground! Good call. Mark this one as solved. Thanks for the help.