Hey all, I am a little stumped on what to do with this issue. I have a pretty simple system in a Jeep wrangler. Several years ago I installed an alpine head unit, replaced all the factory speakers and put in an infinity basslink powered sub. All worked well for several years no issues. Recently the sub stopped working. Power light was coming on when the head unit was on and all fuses checked out but no sound. I assumed that due to the rough nature of the sub being in the back of a jeep that gets wheeled that it was just time for a new one after all the beating it gets. I installed a new Kicker hideaway and had the same issue.
I did all the basic checks I could think of. I cleaned the ground and tested with a DMM. I got .00 reading from the jeep body to the ground terminal of the sub. The remote turn on wire is getting 12 volts at the sub and the main power cable is also getting 12-14 volts. Here is where it gets strange. Both the new sub and the old one get no sound and just power on. But the voltage at the power terminals drops to 9-10 volts. I initially thought the ground had to be bad so I ran a cable from the negative terminal of the battery (which is new) to the body of the jeep with no effect. Next thing I did was jump the remote turn on terminal to the direct power terminal and now the sub turns on and now I get sound but any volume and it starts clipping. The only thing I can think of is something is wrong with my power cable. Any ideas what would cause a voltage drop at the amp if the ground is good?
I did all the basic checks I could think of. I cleaned the ground and tested with a DMM. I got .00 reading from the jeep body to the ground terminal of the sub. The remote turn on wire is getting 12 volts at the sub and the main power cable is also getting 12-14 volts. Here is where it gets strange. Both the new sub and the old one get no sound and just power on. But the voltage at the power terminals drops to 9-10 volts. I initially thought the ground had to be bad so I ran a cable from the negative terminal of the battery (which is new) to the body of the jeep with no effect. Next thing I did was jump the remote turn on terminal to the direct power terminal and now the sub turns on and now I get sound but any volume and it starts clipping. The only thing I can think of is something is wrong with my power cable. Any ideas what would cause a voltage drop at the amp if the ground is good?
