Posted: Wed Sep 18, 2013 4:18 pm Post subject: Turn signal problem
Having turn signal problems. The rt front bulb is intermittent with rt turn signal on. Rt rear bulb flashes fast. Left turn signal is ok. All 4 hazard flashers work fine.
I have already replaced the hazard flasher in the ip trim panel. I used ACDelco 10359031hazard switch. The symptoms are the same with the new hazard switch, intermittent rt front turn signal. Also noticed the rt turn arrow is dimmer (on the ip cluster) than the left. Both ip arrows same brightness with the hazards on. I'm hoping it's not the multifunction aka turn signal switch. Any ideas appreciated.
When my rear signals were intermittent I found the culprit to be heavy carbon buildup on the bulb/socket contacts. This might be worth looking into - it's easy enough to clean the carbon away with q-tips and rubbing alcohol.
The fast bulb flashing is to indicate to the driver that a bulb is "burned out" , but dirty contacts will give the same symptoms.
I don't think those bulbs are dual-filament, but if they are, one filament is maybe broken? (just a guess, I'd still look for dirty bulb contacts first)
I replaced the oe headlights a about a year ago, so I swapped the original headlight assembly back in, same problem. That eliminates the bulb, socket and wires on the headlight.
The bulb is double filament, one for parking light and the other for turn/hazard.
If the turn signal lever is slowly moved up for a right turn, there is a point which only the rear lamp rapidly flashes and the front is not flashing...my symptoms. Sprayed wd-40 as best I could to try to clean the switch contacts. It's working now but heat seems to cause the intermittent, time will tell.
There is a youtube of a '04 Impala turn signal being replaced without removing the airbag or steering wheel. Looks much easier/faster.
https://www.youtube.com/watch?.....detailpage (skip past the schematic stuff)
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