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I charged battery on 1999 GMC Z71, now my speedometer is…

Customer Question
I charged battery on...

I charged battery on 1999 GMC Z71 , now my speedometer is stuck [ pegged ] at 100 mph . won`t move no matter how much i pray and cuss . Help .

Mechanic's Assistant: Have you tested the battery with a voltmeter? And can you see if it's leaking or not?

The battery seems ok , it went dead when i left dome light on over night . No damage to battery that i can see . Tried to get it out of truck but could not get bolt loose that holds battery in place at bottom . No room to get ratchet in. I can`t find my voltage meter .

Mechanic's Assistant: What is the model of your '99 GMC?

Sierra v-8

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

Yes i am attempting to fix it myself , besides the customary praying and cussing , i have beat on the plastic cover over the speedometer needle , turned the truck on and off and drove it up and down the road while doing all the aforementioned things .

Submitted: 8 months ago.Category: GMC
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Answered in 23 minutes by:
10/4/2017
GMC Mechanic: Mike S., ASE Certified Technician replied 8 months ago
Mike S.
Mike S., ASE Certified Technician
Category: GMC
Satisfied Customers: 8,080
Experience: GMC N.A.I.S.E. Certified Auto-Mechanic
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Hi, I am Mike, welcome. I'm reviewing your question.

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GMC Mechanic: Mike S., ASE Certified Technician replied 8 months ago

On the left rear of the transmission is where the speed sensor is located. It has 2 wires, a purple/white and a light green/black, make sure it didn't become disconnected and also check that connection there for being loose.

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