buddy with a 2000 electrical problem
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You can check the speakers by taking the panels off and hooking a 9V battery to the speakers and see if the voice coil bounces the woofer. If so the speakers are working. If you have the infinity system the front speaker will have an amp connected to the 6x9 speaker you can remove the amp and test the speaker after the amp. Maybe the entire left channel in the stereo head is bad. You should be able to check for 12 volt signal on the seats on the outgoing side of the heater seat switch. If there's power the heater in the seats may be deffective. If no power start tracing it back from the seat. You can also get on All Data.com and pay 20 bucks and get a pretty good breakdown of the wiring for your truck along with other info. Hope this helps
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