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Message: <blockquote data-quote="80_Cutlass_mn" data-source="post: 452143" data-attributes="member: 545695"><p>You definitely have a problem with the ground that your h/u is seeing.  Thats why it sparks when it hits the din cage because somehow the din cage is grounded and then also the reason why it will only come on when the antenna is hooked up is because the antenna has a ground on it also and when its connected this grounds the h/u as well and it sounds like your main ground is coming through the antenna wire.  Im willing to bet that if you put a good ground on your h/u, which there should be a black ground wire in the h/u wiring harness, then you wont have this problem.  All you have to do is find a bolt that direct bolts to the chassis.  A good place to find this would be the bolts that hold the pedals in your car to the firewall.  Good luck troublshooting your system.</p></blockquote><p></p>

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