Turn signal issue

[Nukeflash]

Last week I started to have a problem with the turn signal in my 2002 Tahoe Z71. All of the lights would flash rapidly, and the side I was activating would burn the brightest. The rear Cyclops light also flashed. Immediately I replaced the flasher under the dash, that didn't work. Armed with a lot of information, I decided to order a new turn signal and install it. THAT DIDN'T WORK EITHER!! After some addition trouble shooting, I discovered that the problem ONLY happens when the parking lights (or headlights) are on. That is even weirder!! I have removed EVERY relay and fuse related to those lights. It doesn't fix it. Although... when I removed the fuses for the front parking lights, the problem slowed and seemed better. Then I removed the rear parking lights, that ALMOST made it stop, but there was still a faint flashing of the other turn signal flashers on the opposite side. PLEASE HELP!!!

 

[bzbatl]

See if it does this only when the engine is running (run everything straight off the battery). Maybe bad alternator? Check wires from alternator?

Sounds like to me that it's when the alt gets a larger-than-normal pull, i.e. all the lights being on. I'm not an expert here, though - complete shot in the dark.

 

[Nukeflash]

This all happens with the engine off. Tomorrow, I am going to pull each bulb out one at a time to see if there is a short in the bulb. After that... I am stumped!

Thanks for the reply!

Steve