odd electrical short when i use heater?

so everytime i use my heater my right blinker light on the dash stays lit, and when i use my right turn signal it blinks fast on the dash and doesnt work. when i turn the heater to the off position blinker works fine. i’ve checked my fuses and they seem fine. could this be somewhere in the relays? or a shitty ground? any advice would be great.

or a shitty ground
When one circuit, [blower motor] has an effect on another circuit, [signal lights] it is almost always a grounding issue.

Remember blower motor switching is done by grounding the blower motor, [motor has 12V+ as soon as you turn on the ign.] speed of the blower motor is controled by passing that ground through resistors, [blower motor resistor pack]

Signal lights are switched using 12V+ and the signal lights and signal light indicator bulbs all have a constant ground, or should have a constant ground.

First thing I would check is the dash harness grounds, most are low on the drivers “A” pillar, around fuse box.:cross:94

cool thnx for the advice. will do that asap.

thnx for the tip. was a ground.