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When signals are turned on the engine shuts off

Tiny
CALEB9629
  • MEMBER
  • 1994 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
In my truck when I turn on the blinker it shuts the truck off. I can use the hazard lights fine and all the other lights work and do not affect the truck at all. Any ideas on this issue is it common? Any possible way it could be the computer? If so how can I check it? Thank you
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Tuesday, November 22nd, 2016 AT 5:20 PM

9 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If only one side check for a short in wiring, it is probably not the computer. It can be the multi function switch or flasher etc.
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Wednesday, November 23rd, 2016 AT 7:04 AM
Tiny
CALEB9629
  • MEMBER
  • 5 POSTS
Here is an update I checked the switch and it is okay, but now when I turn the headlights on it shuts the truck off and it is not just shutting it off it is like I disconnected the battery everything resets any ideas? I thought it might be ignition switch until I realized the head lights were doing as well. Please help it is my daily driver.
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Wednesday, November 23rd, 2016 AT 7:42 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your grounds for headlights they are non header panel where radiator bolts to. It is definitely a short, but that will have to be physically found.
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Wednesday, November 23rd, 2016 AT 7:55 AM
Tiny
CALEB9629
  • MEMBER
  • 5 POSTS
I understand that it is a short, but I can not find a direct relation between the headlights and blinkers that would cause this problem. Could it be a short in the fuse panel that is on the floor inside the cab? I checked all fuses and wires that I could get to and all the grounds under the hood.
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Wednesday, November 23rd, 2016 AT 9:29 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
You supplied very little info about your truck.

Please send Model/ sub-model/ engine size/ etc/ etc, your VIN might also help out a lot.

Not knowing a bunch about your rig, it may also help to know if it has Daylight Running Lights or any other special kinda bells and whistles that may vary model to model.

I will attempt to find a correct wiring diagram in "Prodemand" that 'could' 'possibly' aid in finding your problem. Many times you must be very specific in the 'prompts' they ask for as they funnel you down to a diagram.

I'm more of a Jeep kinda feller, I'll try to give you a hand going over a diagram. The cool thing here is that there are already some of my colleagues working on this (others may still jump in), the new info you supply, or maybe that I locate might collectively help to find a solution to your dilemma.

Thanks a bunch

The Medic
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Wednesday, November 23rd, 2016 AT 10:07 PM
Tiny
CALEB9629
  • MEMBER
  • 5 POSTS
It has 350 motor the truck is bone stock just a Silverado 1500 4x4 it doesn't have the activated running lights you have to turn them on manually using the switch on the dash left of the steering wheel. Has ac not sure if that makes a difference. Extended cab power windows and locks manual 4x4 has lever on floor not the push button style automatic overdrive transmission not sure what else u might need
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Friday, November 25th, 2016 AT 11:38 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
If I can add in here, it sounds like the battery is shorting out when these accessories are flipped on.

Lets start with a load test first,

https://www.2carpros.com/articles/car-battery-load-test

Please let us know happens so it will help others.

Best, Ken
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Saturday, November 26th, 2016 AT 8:05 PM
Tiny
CALEB9629
  • MEMBER
  • 5 POSTS
Update. Well the problem as stopped for some unknown reason
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Sunday, November 27th, 2016 AT 12:42 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
A car that fixes itself! My favorite kind. Lets us know if it acts up again.
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Monday, November 28th, 2016 AT 9:19 AM

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