If you had a high street unit working then you do not have the harmon amp and speaker set up, unless someone has bypassed the door amps. If you have bought a pu9836 then it can only work with the harmon amps. As I said before the pu9837 has a built in amP but no autochanger control, the 9836 does not, both have two aerial inputs, one is fm/am(black) the red is fm only. Both aerials need power as they are "active" aerials. Having worked on the p38 clarion set up, hopefully I can assist.
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