Hi, I just installed an Alpine mrp-m450 mono amp in my car.
The amp light goes on when the Alpine HU is turned on but goes off after 1-2 sec. I've checked all my connections: Amp wired to battery with 8 gauge. RCA inputs OK. 8 gauge ground. Speaker connections ok to Alpine sub at 4 ohms.
I thought it would be the remote turn on, but I'm getting a constant 12 volts to the amp turn on connection. I even wired it directly to an accessory 12v lead but it won't stay on. Has any one else had this problem with an amp? The amp and subwoofer are new. Thanks for any help.
Im having the same problem with my amp, I took it to best buy and they said the amp was recieving power and recieving signals from the deck and i had everything hooked up right but that in the circuit board all the connections were blown, meaning i have a blown amp, i hope this isnt your problem but it definetly sounds like it. GOODLUCK
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Re: Alpine mrp-m450 Amp won't stay on
Sounds to me like it might be the remote turn on because the first time i installed it, it did the same thing, and i found out that there is two blue wires coming out the stereo, one with a white stripe, i connected it to the blue wire, and it didnt work, then i connected it to the blue and white wire, and it worked. Well hope this solves your problem, goodluck.
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The amplifier may be overloaded, check to see if it can handle 4 OHM loads and 2 OHM loads. if it turns off at high volume the amp may be overloaded. if so try a 8 OHM load. if it still turns off it may be an internal problem.