Need Help!!!

[jhering1986]

Alright so here's the deal: I have a Rockford Fostgate 300 watt amp hooked up to pioneer 6x9's in my car. I've had this hooked up for 4 years now and never had a problem. A few months ago I noticed that the sound from the 6x9's would cut out and then cut back on. I knew it was going to be a problem but left it until finally it went out and stayed out. I checked the fuses on the amp and CD player(aftermarket Pioneer approx. 6 years old) and everything was fine. Checked the fuse on the power line coming from batt. and it was fine. I have the amp ground wire hooked to the chassis and the remote wire coming from the remote wire on head unit. Now here is the weird part: when the car is off,I get 12.5 volts from the batt. and the remote wire and when I connect the power and ground to the amp, I get 12.5 volts but when I connect the remote wire to the amp, the voltage drops 3 volts at the power wire and remote wire. I took a wire and bridged the power input to the remote wire input on the amp and the amp works for a few minutes, but then the sounds cuts on and off when I adjust the volume on the head unit. I bought a new amp and hooked it up and I got the same results so I'm pretty sure the amp is not bad. I also just changed the remote wire also as well as the RCA cables. What could be the problem?

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[11SE2HEAR 10+ year member]

I have seen issues with fuses being defective. If its an AGU glass fuse, sometimes the connection internally can be intermittent, but you can't really see it. So maybe when the amp is drawing current, it's causing the connection in the fuse to heat up, causing resistance and a drop in voltage. When the amp is cutting in and out, measure the Voltage on the turn-on lead from the radio to see if there's a Voltage drop. Might want to check out the fuse, possibly change it out. Also check to make sure there's not any nasty corrosion around the fuseholder and/or battery clamp.

 

[jhering1986]

Well here is an update: I went and looked at it this morning and I tested both speakers with a 9 volt battery and they work so I know it's not them. Then I disconnected them and the RCA cable from the amp and tried my jumper again but it didn't work this time. Could it possibly be a bad ground wire?

 

[bubbagumper6 5,000+ posts]

I have seen issues with fuses being defective. If its an AGU glass fuse, sometimes the connection internally can be intermittent, but you can't really see it. So maybe when the amp is drawing current, it's causing the connection in the fuse to heat up, causing resistance and a drop in voltage. When the amp is cutting in and out, measure the Voltage on the turn-on lead from the radio to see if there's a Voltage drop. Might want to check out the fuse, possibly change it out. Also check to make sure there's not any nasty corrosion around the fuseholder and/or battery clamp.

Well here is an update: I went and looked at it this morning and I tested both speakers with a 9 volt battery and they work so I know it's not them. Then I disconnected them and the RCA cable from the amp and tried my jumper again but it didn't work this time. Could it possibly be a bad ground wire?

Did you even read what he said? Go check your **** fuses. You should have spare fuses anyway (if you don't, go buy some). Swap them all out with fresh ones starting first with your main power line.

 

[jhering1986]

It was the ground wire, must have been loose or something. took it off and put it back on and its good now.