Having some electrical problems after alternator repair
Had my alternator repaired on my 2002 exalta, after it was reinstalled, dash clock, stereo, high beam, alarm and power locks are not working. A/C fan stays on highest setting while engine is turned on(even when A/C is off). all fuses are good. ecu problem or some relay switches?
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you have to send out your whole cluster. it is a common thing that goes wrong with the gm dash clusters. you need a expert electrical guy to repair. look on ebay, guys fixing them and replacing lights in your stereos and other dash clusters.
It depends on what it is or isn't doing....no power? Check source and wiring. No sound? Check speakers and wiring. If your discs don't play, the player may be jammed or the laser could have malfunctioned, etc. regardless of the issue, you will have to remove the stereo to diagnose/repair it. Since you would already have the assumed stock stereo out of the dash, why not just replace it with a much better quality one for under the price of repairing/wasting time with the stock p.o.s. Most stereo retailers have adapter plugs and dash inserts to make installation simple.
Unusual the dealer can't or won't find the problem. A mechanic would check everything in that circuit for shorts to ground. Was the fuse blowing before the alternator and battery were replaced ? Based on the wiring diagrams I would vote for a defective alternator. The 10 amp fuse number 8 powers the cluster which also goes to the alternator. If the alternator shorts out internally it would blow that number 8 fuse and take the cluster with it. The other circuits you mentioned are controlled by the key switch but are fused after the switch. So if the switch was causing the problem it should be blowing a 40amp fuse. I would probably take the alternator off and have someone else test it.