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2002 gmc envoy_sle
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It sounds like your friend just hard wired your head unit into your TB. He should've have used one of the recommended harnesses to install it. I don't remember all the harness part numbers but someone else will chime in eventually.

Do not get a cap. Upgrade the battery under the hood. Do the Big 3. Increase your power and ground cables. If they still dim then add a second battery in the rear.
 
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