I have a sony 175 watt amp mounted under the rear seat that powers my sub woofer, once in awhile the amp shuts off, I took apart the fuse connector at the battery and reconnected the ends and all was well for a few days and it did it again, I checked the voltage at the amp and it was only getting6 amps, again I took the fuse assembly apart, put it back together and all was well for a couple weeks.
Well it went out again so I checked the voltage at the amp and it was only getting7.66 amps, I played with the connections at the battery making sure all connections were tight, but can't get more that 7.66 amps. So I'm wondering if the length of the power wire is too long or if the gauge is too thin. I bought the (red) power wire in a kit for radio and amp install at a local audio shop. Any ideas? My son gave me a much thicker wire than the one I have and will try installing it this weekend.

 

the legnth of you power wire shouldnt matter depending on how long it is and its gauge. but with only a 175 watt amp this is not your concern as long as you have at least 4 gauge you will be good. in my experience most power problems come from faulty grounding. make sure you amp is grounded well to a bolt on the frame. if that doesnt do it run it for awhile and see if it is getting hot being stuck under your seat as most amps have thermal protection built in. also when you checked the amperage was the stereo turned up? voltage is the only constant the amp will pull what amperage it needs when it needs it (to the best of my knowledge) so it would pull more when it was in use and use very little when turned down. also check and make sure it reads at least 12v with the car off and 12 - 15 with it running. if all else fails check and make sure your remote turn on is not lose behind the head unit

 

Thanks for the info Holbrodu, I checked the ground, o.k., then connected the heavier wire my son gave me and still no power, I checked and redid the connection for the remote turn on and still nothing, then my son checked the voltage at the amp and it read 7 volts, he then checked the battery - 12 volts, then he checked voltage at the end of the fuse - 7 volts, he then checked the voltage just before the fuse - 12 volts, he went and got another fuse (a 30v) and "wala" the sub started thumpin'. So it turned out to be a defective fuse, although it LOOKS fine. I went and bought a new 60vfuse and found that the new one is about a 16th inch taller than the old fuse, put it in and I B bumpin' again. [sm=happybounce.gif]