Have an 88 gta with digi dash. Ive replaced all the exterior bulbs with leds. All lights work fine when the headlight/running light switch is off. Turn the headlight/running lights on, and i loose turn signals on the rear and side marker lights. Front turn signals still work. Yes ive replaced both flasher relays with union pacific flasher relay pn 90649. Still problem persists. Ive tried installing load resistors on the front turn signals, problem persists. Installed load resistors on front turn signals and front side marker lights, issue remains. Im at a loss here. How can i get all the leds to work correctly?