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Message Forums Car Stereo Message Forums > Amplifiers > Amp turns off in seconds after ignition
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jeitnier
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 Amp turns off in seconds after ignition

Hey guys,

This is my first post here unfortunately because I'm having some problems that I can't for the life of me figure out...

I'll start out by describing my setup:
Head Unit: An Alpine Unit (about 3-4 yrs old) with ipod hookup and preamps in rear
Amp: Alpine MRP-M350 Mono Amp
Subs: Alpine SWE-1242 Type E 12"s x 2
Subs are wired in bridge to the amp.

Alright, here's my issue...a few days to a week ago I was driving and noticed I had no power to my subs. I checked my amp, and my power light was off. I checked my connections, unscrewed my terminals and rescrewed them in tightly and nothing. I work property management around my area, so I make at least 10-20 stops a day for my job. After I adjusted the connections, a few trips later I started my ignition and they fired right up, normal volume and all but in a few minutes failed and my amp shut off. I checked it all again, and decided to start from scratch and re-terminal and solder all my connections because I found some to be loose. After that I checked my ground and noticed some rust. I sanded my ground location down to bare metal tonight and no change - turns on and right back off or not on at all. So I grabbed a spare piece of 4 gauge wire and touched my remote terminal to the battery terminal on the amp and voila, I got a light - however, it would turn on and fade, turn on then fade, etc etc. I'm not sure if that's normal or a sign that I'm suddenly pulling too much power.

Anyway, I'm stuck. I've tried everything I've read online and everything I could logically think of. My fuses are all intact (at the post on the battery and both 20A's on the amp). I have no signs of dimming or battery discharge. I've had this exact same setup for 3-4 years and have never had a single problem with my system until recently. I've always used 4 gauge power wires and 4 gauge ground and for this setup I think it's probably overkill or on par at best to use those gauge cables.

So where do I go from here and what should I check next??? ANY input would be greatly appreciated!!! Music is so boring without the twins

-Jared

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New Post 09-23-2009 01:55 PM
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jpsaudio
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your amp might just have seen its last battle brotha.....sorry to say that it might be failing maybe you need some amp viagra since you cant get it goin...lmao naw but seriously the way it sounds like your amp wants to cut on but cant...i dont know if you know an amp doctor or if we have any on this forum...but i have a friend from my fiberglass forum that works for Sundown and sales Sundown audio i can give you his info if you wanna try and bring it back to life or at least officially see wats wrong with it

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New Post 09-24-2009 10:46 PM
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maryland33
Member

 

Try disconnecting the speaker wires then the rca's,each time cycling the ignition on and off,see what happens.My 850 Alpine did the same thing,come to find out it was 1 strand of speaker wire touching the basket of the sub!

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New Post 09-24-2009 11:05 PM
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jeitnier
New Member

 

yeah i figured it out....i went out and picked up a multimeter to check all my connections the proper way.  i wasn't getting voltage at one post of my inline fuse holder even though the fuse looked perfectly fine...so i replaced it and all better.  guess that'll teach me and everyone else who tries to shortcut a problem...get a multimeter and do it right, it'll save you a ton of time and headache....thanks all!

-Jared

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New Post 09-25-2009 11:58 AM
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sicaudio
Senior Member

 

sounds like you are using glass fuses?  if so get rid of them they actually cause that problem alot.  blade type or ANL are the best to use.

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New Post 09-25-2009 02:56 PM
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