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Wiring, Electrical & Installation
Power drop at remote wire
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<blockquote data-quote="Deiimos" data-source="post: 8774951" data-attributes="member: 682903"><p>I agree 8 gauge ground isn’t going to cause the problem, changing the ground to 4 gauge isn’t necessary at this point. That amp will function on 8 gauge.</p><p></p><p>Just to add to it.</p><p>Continuity, resistance, and voltage measurements can sometimes be misleading by themselves, it’s an okay quick test on things, but sometimes not definitive of a good connection and you have to understand how to apply it when troubleshooting. A bad connection could easily show good voltage and perfectly okay resistance, however, when you try to pass current through it, it can’t do it and cause a big voltage drop.</p><p></p><p></p><p>For your voltage measurement to be more useful, you would power on the amplifier, let it sit at 4-6 volts, and then measure voltage at your fuse holder, and across the ground wire at the amp (not sure if you had the amp on or not in that last photo), or from a real chassis ground to the amp, to see if you can see at what point it is being pulled down or a voltage across ground when there shouldn’t be. I see you’re ring terminal has the red rubber boot over it, likely fine, but I would slide that rubber boot back and inspect all connections like that. I’ve seen people’s crimps where the ring terminal could easily slide off by hand after they crimped it, which is not good for a high current connection.</p><p></p><p>Deon gave a great example of following the path looking for the drop. You measure voltage at the fuse holder and get 12.9v, but then you turn the amp on and that reading goes down to 5v, you know it’s a problem at the fuse holder or battery connection, depending which side of the fuse holder indicates the drop. If it stays at 12.9, then the problem is closer to the amp, or the ground.</p><p></p><p></p><p>Another thing, you could try unplugging your RCA cables at the amplifier, then power it up and measure voltage again at the amps terminals and see if it drops any, some amps can try to pass power through the RCA shields if you lose the main power ground which isn’t good.</p></blockquote><p></p>
[QUOTE="Deiimos, post: 8774951, member: 682903"] I agree 8 gauge ground isn’t going to cause the problem, changing the ground to 4 gauge isn’t necessary at this point. That amp will function on 8 gauge. Just to add to it. Continuity, resistance, and voltage measurements can sometimes be misleading by themselves, it’s an okay quick test on things, but sometimes not definitive of a good connection and you have to understand how to apply it when troubleshooting. A bad connection could easily show good voltage and perfectly okay resistance, however, when you try to pass current through it, it can’t do it and cause a big voltage drop. For your voltage measurement to be more useful, you would power on the amplifier, let it sit at 4-6 volts, and then measure voltage at your fuse holder, and across the ground wire at the amp (not sure if you had the amp on or not in that last photo), or from a real chassis ground to the amp, to see if you can see at what point it is being pulled down or a voltage across ground when there shouldn’t be. I see you’re ring terminal has the red rubber boot over it, likely fine, but I would slide that rubber boot back and inspect all connections like that. I’ve seen people’s crimps where the ring terminal could easily slide off by hand after they crimped it, which is not good for a high current connection. Deon gave a great example of following the path looking for the drop. You measure voltage at the fuse holder and get 12.9v, but then you turn the amp on and that reading goes down to 5v, you know it’s a problem at the fuse holder or battery connection, depending which side of the fuse holder indicates the drop. If it stays at 12.9, then the problem is closer to the amp, or the ground. Another thing, you could try unplugging your RCA cables at the amplifier, then power it up and measure voltage again at the amps terminals and see if it drops any, some amps can try to pass power through the RCA shields if you lose the main power ground which isn’t good. [/QUOTE]
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Power drop at remote wire
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