Sub cuts out at ~15V

[maxmayhem]

Greetings

My sub cuts out when my RPM's are high and my alternator is throwing out ~15VDC.

When the idle/voltage is lower (red light/city driving), I can crank it to max and it works perfectly.

My theory is that 15V is too much and trips the breaker. I was thinking maybe some sort of voltage regulator somewhere in the lines? Though, the ones I've seen online have very low wattage.

Any ideas/suggestions would be greatly appreciated //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

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[LosIsATool 5,000+ posts]

What amp? Some are are happy that high

 

[maxmayhem]

Alpine MRP-M500

 

[LosIsATool 5,000+ posts]

Website says it can go up to 16v

 

[maxmayhem]

Maybe a bad fuse?

 

[fatboytyler]

What alternator do you have that is charging at 15 Volt? Could be something else in the electrical causing the problem.

 

[maxmayhem]

Bosch AL502X 60A

 

[ThatChevyGuy 5,000+ posts]

do you have any secondary batteries? You may have a bad regulator

 

[maxmayhem]

Just 1 battery, recently purchased refurbished.

The alternator has an internal regulator, recently purchased new.

 

[fatboytyler]

Just 1 battery, recently purchased refurbished. The alternator has an internal regulator, recently purchased new.

That would likely be a stock alternator then, so I highly doubt it should be charging that high. How do you know its that high? If the regulator has gone bad it could be spiking the voltages at high RPM causing the amp to cut-off.

 

[maxmayhem]

I have a volt-meter under the dash. ~13V at idle (depending on lights, wipers, heater, etc), 15V highway.

I purchased the alternator about 4-5 months ago.

 

[maxmayhem]

I was wrong about the voltage regulator, it is external.

I have replaced both the alternator and voltage regulator.

The highest voltage it has gone now is 14.8V, and no problems so far. I haven't had a chance to test on the highway yet.

Hopefully it is fixed. I will try it for awhile and report my findings.

Thanks everyone. //content.invisioncic.com/y282845/emoticons/thumbsupwink.gif.129404938effda6ad9cca39e7f4b58a3.gif