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Turn Signals All Blink



I have a 2004 Chevy Tahoe. I recently upgraded the headlights (with Halos), parking lamps, and tails to aftermarket versions and converted the bulbs to LED. I added the Novita LM487 Flasher to get rid of the hyperflash. Everything worked great. 


I then had a new Kenwood Headunit installed (Excelon DNX996) and replaced the engine with a new 6.0. 


I say all of this because somewhere between the head unit and engine, unless I have my parking, fogs, or headlights on, All of the accessory lights (outside only) blink unless I have the fog, parking, or headlights on. I have replaced the headlight and foglight switch, installed a new LM487, and checked the wiring to the lights. Same issue persists. 


Wondering what it could be? I was thinking there may be a loose ground somewhere from the stereo install causing the blinkers to work correctly only when the lights have power? OR I am thinking it could be a bad Multi-Purpose relay in the fuse box. 


Any ideas on what it could be or what else could be going on?


Thank you. 

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More than likely there's a ground that didn't get reconnected during the engine, or lighting swap.

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