blinker confusion

[greengiant]

Left, rear, turn signal on the truck does not work when hooked up to TT, but TT left signal works. When not hooked up to TT, truck signal works. Any quick suggestions on what's going on?

[jsmith948]

I would start by checking all of the grounds and clean all of the contacts (bulbs & sockets).

[Bluewater]

I agree sounds like some kind of bad ground.

[greengiant]

I will take a look at the grounds and contacts and see what I can find out.
Thanks for the help.

[greengiant]

I had a spare blinker bulb for the truck, so I thought I'd try that first. After putting that in, the blinkers on truck and TT both seem back to normal. I usually keep better record in my truck maintenance book, including bulb changes, but for some reason I missed adding which truck turn signal I changed about a year ago. Hopefully nothing funny is going on and I was just a bad bulb. Thanks