Question about 1999 GMC Suburban
It is a ground problem due to these issues you just noted,you need to start at the relay box and disconnect this circuit or at the very end of this circuit and start from there and proceed forward to the relay/fuse box(as in the left hand turn signal) on this vehicle the right and left are on separate circuits,so it tells me your problem is on the left side circuit,and as you say when you push the horn button the headlights get brighter(POOR GROUNDING CIRCUIT) which says its making a better/lower resistance ground through this combination buss bar off the same circuit breaker,also check the turn signal flasher located behind the dash board near the drivers door panel up front
Posted on Apr 11, 2011
Without being there to see this problem 1st hand diagnosis will be based on what problems I know cause these types electrical problems. The first theng i would do here is pull the **** shell covers off the steering column and check for any burnt wiring, this has been a source of similiar problems in other Suburbans. If wiring and connector pins to the Combination switch (this is the turn signal switch) look ok and are not discolored from heat then it is likely the combination switch is defective. Circuits are cross feeding insiode the switch due to heat damage most likely, that is why the seeminly crazy symptoms you have. The Combination switch is expensive and i think you should have a shop check this before repalceing the switch. Before you start any work discnnect the battery negative cable. Here are the instructions for replacing the switch.
Refer to this picture for exploded view of the whole assembly. You will need access to a scanner to reset the SRS (Airbag).
Posted on Apr 08, 2011
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Posted on Jan 02, 2017
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