Odd Signal Indicator Behavior - The 1947 - Present Chevrolet & GMC Truck Message Board Network

palallin · 10-08-2019, 12:43 PM

This is a new one on me. while driving home last night, my truck's right turn signal indicator flashed randomly on the dash. It was intermittent, sometimes remaining on a few seconds, other times flashing rapidly or slowly. There were long periods when it was not lit at all.

So far as I could tell from the driver's seat, there was no corresponding odd behavior of the actual signal lights, front or tail.

Any ideas where I might begin to look?

**MySons68C20** · 10-08-2019, 01:41 PM

Check the 4 ways and see if they work correctly. If so, you may just need to replace the turn signal flasher.

*randy500* · 10-08-2019, 01:47 PM

Quote:

Originally Posted by MySons68C20

Check the 4 ways and see if they work correctly. If so, you may just need to replace the turn signal flasher.

Or add a ground wire, anyplace it doesn't matter.

*randy500* · 10-08-2019, 01:50 PM

Honestly its probably the turn signal switch, its hanging up partially disengaged, take the turn signal cam out, clean the contacts and lube with white lithium grease. The switch will work much smoother and with less effort too.

**MySons68C20** · 10-08-2019, 01:52 PM

Quote:

Originally Posted by randy500

Or add a ground wire, anyplace it doesn't matter.

Add two just to be safe

palallin · 10-08-2019, 09:39 PM

Does it matter that this behavior only happens with the headlights on? I have not seen it driving in the daylight (and I made a point of closely watching today).

TruDom · 10-09-2019, 08:28 AM

Quote:

Originally Posted by palallin

Does it matter that this behavior only happens with the headlights on? I have not seen it driving in the daylight (and I made a point of closely watching today).

i have the exact same issue. flickering right turn signal with headlights on and its only after driving it for about 10 minutes.
new AAW wire harness. new bulbs. new dakota digital gauge cluster.
took apart the turn signal switch in the column and cleaned it... no help.
i still think its a ground to one of the light housing but havent really troubleshot yet.

*randy500* · 10-09-2019, 09:02 AM

Dull turn signal glow is from a front light housing that is not grounded, the ungrounded housing is on the same side as the dull glowing/blinking turn signal indicator.

Check the bulb too, could be a bad filament making contact with the headlight/front lamp brown wire.

palallin · 10-09-2019, 10:45 AM

A friend of mine in the old tractor field, has a mantra: "Check the grounds, check the grounds, check the grounds." Looks like that will be where I start.

Thanks, guys!

**MySons68C20** · 10-09-2019, 10:56 AM

Excellent idea

Please let us know what you find.

10-08-2019, 12:43 PM	#1
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,238	Odd Signal Indicator Behavior This is a new one on me. while driving home last night, my truck's right turn signal indicator flashed randomly on the dash. It was intermittent, sometimes remaining on a few seconds, other times flashing rapidly or slowly. There were long periods when it was not lit at all. So far as I could tell from the driver's seat, there was no corresponding odd behavior of the actual signal lights, front or tail. Any ideas where I might begin to look? __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

10-08-2019, 01:41 PM	#2
MySons68C20 Senior Member Join Date: Sep 2014 Location: Wenatchee, Wa Posts: 929	Re: Odd Signal Indicator Behavior Check the 4 ways and see if they work correctly. If so, you may just need to replace the turn signal flasher.

10-08-2019, 01:50 PM	#4
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: Odd Signal Indicator Behavior Honestly its probably the turn signal switch, its hanging up partially disengaged, take the turn signal cam out, clean the contacts and lube with white lithium grease. The switch will work much smoother and with less effort too.

10-08-2019, 09:39 PM	#6
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,238	Re: Odd Signal Indicator Behavior Does it matter that this behavior only happens with the headlights on? I have not seen it driving in the daylight (and I made a point of closely watching today). __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

10-09-2019, 09:02 AM	#8
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: Odd Signal Indicator Behavior Dull turn signal glow is from a front light housing that is not grounded, the ungrounded housing is on the same side as the dull glowing/blinking turn signal indicator. Check the bulb too, could be a bad filament making contact with the headlight/front lamp brown wire.

10-09-2019, 10:45 AM	#9
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,238	Re: Odd Signal Indicator Behavior A friend of mine in the old tractor field, has a mantra: "Check the grounds, check the grounds, check the grounds." Looks like that will be where I start. Thanks, guys! __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

10-09-2019, 10:56 AM	#10
MySons68C20 Senior Member Join Date: Sep 2014 Location: Wenatchee, Wa Posts: 929	Re: Odd Signal Indicator Behavior Excellent idea Please let us know what you find.



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