Amp isn’t working
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=41635
Printed Date: May 03, 2024 at 6:23 AM
Topic: Amp isn’t working
Posted By: DukeDuke
Subject: Amp isn’t working
Date Posted: October 25, 2004 at 5:56 PM
A friend of mine has a Rockford 900 watt amp, he went to install it in his new car and it would just fry his fuse and wouldn't work, and that is all it would do, it would never work, he took the cover off, and there is nothing that looks busted or burned, does anyone have any idea what it is or could be?
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Duke Duke
Replies:
Posted By: stevdart
Date Posted: October 25, 2004 at 6:12 PM
That happened with a good ground and no speaker load connected?
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: DukeDuke
Date Posted: October 25, 2004 at 6:16 PM
He had it connected directly to the frame.... he didn't a a speaker load on it.
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Duke Duke
Posted By: DukeDuke
Date Posted: October 25, 2004 at 6:17 PM
Whoops, he DID have a speaker load on it, and it was directly connected to the frame. ------------- Duke Duke
Posted By: stevdart
Date Posted: October 25, 2004 at 6:45 PM
Well, he should isolate the problem. First test ground at amp to battery neg for a good reading of less than an ohm resistance. Then, check power wire entire length for any nicks, cuts, abrasions, wear. Then disconnect input RCAs and output speaker load. Test amp again. Darn fuses can get expensive without a battle plan, eh?
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: DukeDuke
Date Posted: October 25, 2004 at 7:05 PM
Yeah, I told him to check the wires, which he did, nothing, looks brand new, nothing worn or anything. But, what I just found out had happened, when he had it installed in his last car, the ground came lose and hit the amp, causing a big pop, what would that have done?
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Duke Duke
Posted By: stevdart
Date Posted: October 25, 2004 at 7:34 PM
Go through the steps of isolating the problem.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: jeffchilcott
Date Posted: October 25, 2004 at 8:14 PM
that could have grounded the amp through the chasis of the amp, could have fried lots of components try the steps steve said if that dosent work open the back and take a look, unless its still under waranty somwhere then take it back...If not open it up look at the mosfets along the sides, and look at the resistors and other small items by the fuse, also look at the large coil in the amp see if that smells burtn good ways to tell if your amp is fried
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Posted By: ScoutnBout
Date Posted: October 26, 2004 at 1:12 PM
stevdart wrote:
Well, he should isolate the problem. First test ground at amp to battery neg for a good reading of less than an ohm resistance. Then, check power wire entire length for any nicks, cuts, abrasions, wear. Then disconnect input RCAs and output speaker load. Test amp again. Darn fuses can get expensive without a battle plan, eh?
---Glad to see the topic was still fresh and I had time to read your post steve. I am having a similar problem with a completely rewired (Ron Francis) Scout II. Aometimes us Alericans think too hard (so the Aussie's say) and if I would have just taken a breather, I might have thought "Gee Tom, you have about 10' total of (+) and (-) leads and maybe you just aren't getting power to the amp, even though there is spark. Try setting up the amp under the hood of the Scout and seeing if it works" ---Going to cruise the board now and hopefully someone will have input on my cheap-o Road Gear amp in my post... when I check back in later. -------------
Posted By: 94legend
Date Posted: October 26, 2004 at 1:38 PM
I had this same problem with a fosgate amp, 900x1 rms @ 2 ohmz . the the fuse would blow on the fuse holder.
Or when you connect it to the amp there would a static shock or spark i'm i correct? You said you bought it new? where from? return it and get a new one. I dont believe that if you were to buy a new one that would happen. Most likely where u got it from was refurnbished. Same happen to one of the amps i came across. I took the fosgate amp apart nothing looked damaged or fried. We kept running it over, eliminating the cause of the short. One time, it even caused the headunit to not operate correctly. so we took the dang thing apart and went to best buy, bought the same exact model, returned it with the broken amp, and said "customer change of mind" we told them there was not defect just the fact that we were not satisfied.
Now a days its hard to find that old model because most audio shops carry the new fosgate amps. I believe its the p0004 or what ever. But yeah let me know whats up with it now !
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