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GMC Forum: Speedometer, gas gauge, temp gauge don't work
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Old 12-11-2009, 08:10 PM
aqt5882 aqt5882 is offline
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Default Speedometer, gas gauge, temp gauge don't work

My speedometer, gas gauge, and temp gauge don't work. The cluster lights up but when turn the the key on the on mode, only the check engine light comes on, but not the battery. If I push on the column, there's a turn signal sound that's made. Can anyone tell me what's wrong? I bought a new cluster, but that wasn't the problem. Please help me
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Old 12-11-2009, 09:36 PM
Molson02536 Molson02536 is offline
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Check the fuse, and if the fuse is good. Then check the fuse terminal with the ignition keys in the on position. The ignition lock may have gone bad and will need to be replaced or the wire harness from the ignition keys down the steering column has gone bad. The ignition switch it self may be going bad and may need to be replaced.

If you have many keys on your key chain, this will promote the ignition keys to fail. The ignition switch's job became more complex as accessories like radios, electric windshield wipers and heater blower motors were added to vehicles. Moving beyond its original role as a simple on-off switch for the engine's ignition system, the ignition switch was also designed to supply electricity through an accessory position on the switch. This allowed accessories to function in a key-on, engine-off situation without overheating and oxidizing the contact points in the engine's distributor. As more accessories like power windows, power door locks, power seats, air conditioning and electronic automatic transmissions were added, the ignition switch's job became even more demanding.

Today, the ignition switch is a complex device that powers numerous electrical and electronic systems throughout the vehicle. In fact, the newest version of the conventional ignition key is an electronic device that identifies the driver and allows him to activate the starting system on demand.

Most ignition switches incorporate spring-loaded, sliding contacts to transmit adequate amperage to individual fuse and relay circuits. As these contacts begin to wear, they may lose their ability to make perfect mechanical contact. In other instances, they may begin to oxidize due to heavy amperage flow. In either case, the contacts begin to develop electrical resistance that reduces amperage flow through the ignition switch.

Very few ignition switches fail catastrophically. Most begin to fail intermittently and are usually sensitive to temperature and humidity. If the internal sliding contacts are heavily greased during assembly, the grease may begin to harden and inhibit mechanical contact during cold weather. If the switch fails during heavy accessory loads, the internal sliding contacts may have become heavily oxidized or succumbed to heat distortion and loss of mechanical integrity. In any case, most ignition switches give ample warning of an impending failure via intermittent ignition or accessory operation under various conditions of temperature and electrical load.

Good luck and hope this will lead you to addressed the issues your having with your Jimmy. Keep me posted, be glad to know you got your car running 100% again soon.
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Old 12-13-2009, 06:53 PM
aqt5882 aqt5882 is offline
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Join Date: Dec 2009
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Default it was the radio fuse

Well i started taking the steering column apart then i decided to check the fuses again. None of them were blown but my brother told me to test the fuse itself the see if it worked properly. Turns out that although the radio fuse was blown, it also was working on one side so upon changing the fuse, everything else worked. I did not realize one radio fuse would make all that other stuff not work. Thanks for the suggestion anyways and i'll keep that in mind should something similar happen again and it's not the fuse
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