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[quote=Anonymous][quote=Anonymous]I need mechanical advice! I have a 2004 Trailblazer that I think might have an electrical problem. Sometimes while driving, all the lights on the dashboard come on and all the gauges go to zero and the speedometer doesnt work and you can't take the key out of the ignition but you can turn the engine off. If we wait for awhile, it'll go back to normal. Any ideas??[/quote]

Very common thing. More so with Jeeps for some reason, but any car can have this. Basically the dash instrument cluster is a self contained module. It literally plugs into a wiring harness and fits right into a recess in the dash. The contacts in the connector sometimes lose contact when they get jarred or hit a bump or whatever. If you slap the top of the  dash cluster when it happens, usually they pop back on. The fix is take the dash cluster out, slightly bend all the contact pins -again SLIGHTLY, no more than a few degrees, barely perceptible- then add some dielectric grease in the female contacts, and put the whole thing back together. 2000’s Jeeps are very easy to do this on, I don’t know about Trailblazers, I’ve never had some apart for that problem [/quote]

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