2004 chevy trailblazer_ls
how do you keep the batt. in the rear charged ? this is the harness im using on my 04 LS no bose no onstarIt 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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