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Turn Signal Problem

Tiny
KFLOYD
  • MEMBER
  • 2000 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
My right turn signal started to flash rapidly when I turn it on. I checked the bulbs and replaced (even though they did not appear to be bad), still flashes rapidly. I had a trail wiring harness so I disconnected it, still does not work. There was a plug that attached the wires from the truck to the rear lights, which is where the trailer harness was attached, I removed it thinking that it might be the problem and it still does not work. I checked the bare wires from the truck with a tester and I can get the tail lights to work when I turn on my head lights and I can get the left turn signal to work but not the righ turn signal. I followed the wire conduit to the front of the truck and I did not see any areas that looked pinched or damaged. I then lose it when it gets to the front of the truck.
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Monday, April 27th, 2009 AT 1:48 PM

13 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
When they flash fast, do both front and rear lights flash fast too?
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Saturday, May 2nd, 2009 AT 2:06 PM
Tiny
KFLOYD
  • MEMBER
  • 4 POSTS
No, the rear does not light up at all. The front does flash.
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Sunday, May 3rd, 2009 AT 8:34 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you checked for power to the sockets?
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Monday, May 4th, 2009 AT 7:16 AM
Tiny
KFLOYD
  • MEMBER
  • 4 POSTS
Yes, and there is no power to the sockets.
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Tuesday, May 5th, 2009 AT 7:34 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
You need to follow the power wire checking it to see where there is a loss of power. I believe there is a plug in for the tail lights. Make sure it is clean, not corroded, and tight.
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Tuesday, May 5th, 2009 AT 7:40 PM
Tiny
KFLOYD
  • MEMBER
  • 4 POSTS
I did this and I actually checked power at the plug and before the plug and I can get power to show on the left turn signal, and both tail lights but not the right turn signal.
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Wednesday, May 6th, 2009 AT 8:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
If you have power from the plug, either you have a broken wire or the socket itself is bad. Do you have the printed circuit board tail light? If so, I've seen them go bad and cause similar problems.
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Wednesday, May 6th, 2009 AT 8:45 PM
Tiny
ROGER6632
  • MEMBER
  • 19 POSTS
  • 2000 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 193,879 MILES
Checked all bluds, were good, drivers side blinks like it should, passenger side was blinking real fast, there was no blud in backup light, I put one in and they started to work right but they were dim, brake light to.I took a ride and used my passenger blinker, it started blinking like hell again, I tried it again it was ok, it comes and goes I guess
but allways half dim, whats going on?
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Tuesday, November 5th, 2019 AT 3:09 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check the ground on both front and rear of truck on right rear of frame rail and right radiator support for right side and same are opposite for left side. If those are ok then have it scanned for codes as it may be a body module problem.
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Tuesday, November 5th, 2019 AT 3:09 PM (Merged)
Tiny
DICKSON53
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET S-10
  • 85,000 MILES
Rear brake light and blinker wont work. Front blinking rapidly. Running lights fine. Replaced bulb. No change. Dont think is flasher relay, the other side works fine. What else could be the problem?
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Tuesday, November 5th, 2019 AT 3:09 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check for voltage and ground at the circuit in question. Your lower brake lites are wired through the multifunction switch. In the diagram check the turn fuses for voltage, key on, turn signal on. If no voltage that will take us back to multifunctions switch.

Your lower brake lites and turn signal use the same bulb fillament, just not at the same time.
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Tuesday, November 5th, 2019 AT 3:09 PM (Merged)
Tiny
MATTPARLI
  • MEMBER
  • 2 POSTS
I had a similar issue, I put a meter on the fuse box with the turn signal on left then right, voltage was all over the place, I cleaned up the grounds near the blinkers on the radiator core support, then I replaced the wire and fuse going from the battery to a 175amp little fuse then to the fuse box, this solved my issue except for the right blinker, it flashes fine but fast like front and both work fine they just flash fast had a running light out on the right rear as well, just a funny set of symptoms, this may be your issue, sorry for being 4 years late, just wanted to add my experience. Could be your issue, I'm going to put a meter on my sockets to double check. Thank you for your time.
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Tuesday, December 6th, 2022 AT 9:12 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Excellent addition to this thread! Please feel free to use 2CarPros anytime!
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Tuesday, December 6th, 2022 AT 11:28 AM

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