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<blockquote data-quote="Worlddre" data-source="post: 7822429" data-attributes="member: 556661"><p>There are some things you should look for when trying to diagnose a ground loop. First you need to locate the source of the problem. Start by checking the input voltages at each component in the system. Check the battery and then the Hu&nbsp; and amplifiers. A ground loop by definition is a difference in electrical potential between electrical components so if any of the components has a voltage different than that at the battery it could be causing your problem. If all voltages are equal start isolating components in the signal path. Connect the radio to an amplifier outside the vehicle if the problem goes away then the prob is not the radio. Next do the same with the amplifier if the problem goes away then it&#039;s not the amplifier and could be an issue wih your wiring. Run a set of RCAs outside of the car to your amplifier to try and rule out the RCAs. Now the only thing you have left is the speaker wire. If one of the speaker wires is touching ground somewhere it can cause engine noise as well. Pull and reroute your wires inspecting every inch to make sure they are to frayed any where.</p></blockquote><p></p>

[QUOTE="Worlddre, post: 7822429, member: 556661"] There are some things you should look for when trying to diagnose a ground loop. First you need to locate the source of the problem. Start by checking the input voltages at each component in the system. Check the battery and then the Hu and amplifiers. A ground loop by definition is a difference in electrical potential between electrical components so if any of the components has a voltage different than that at the battery it could be causing your problem. If all voltages are equal start isolating components in the signal path. Connect the radio to an amplifier outside the vehicle if the problem goes away then the prob is not the radio. Next do the same with the amplifier if the problem goes away then it's not the amplifier and could be an issue wih your wiring. Run a set of RCAs outside of the car to your amplifier to try and rule out the RCAs. Now the only thing you have left is the speaker wire. If one of the speaker wires is touching ground somewhere it can cause engine noise as well. Pull and reroute your wires inspecting every inch to make sure they are to frayed any where. [/QUOTE]

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