Help.. 2 amps/1 sub

[Digital B 10+ year member]

I'm trying help my friend install his system...

It starts with Memphis 4g wirng coming from the battery to a 2 fared Memphis Digital Cap. Cap is grounded secure. Two 4g wires coming from the cap. Each lead going to a Memphis Power Referance 1000.1. Two grounds coming from the cap, each connected to the amp. The amps connected to a 12W7. The Rca's are coming from a Alpine CDA-9856 headunit. then a set from one amp to the other amp..

All connections are solid and secure.

When you cut the system on.. it'll stay on for 5-10 seconds, then one amp always goes into proteciton. We messed around with it for about an hour, then it got dark on us. Am I missing something.. should I run a seperate set of RCA's on his headunit.. im out of ideas.. any can help?

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[photocrazy8 10+ year member]

look in the owners manual for what could trip the amp into protection mode. does your voltage drop?

 

[Digital B 10+ year member]

Accourding to the Cap.. the voltage is staying around 14/13.9 volts.

 

[photocrazy8 10+ year member]

ok check your owners manual for anything that could send the amp into protection mode? are they getting hot?

 

[Rattlebrain 10+ year member]

I have never messed with a cap but isn't the cap and the amps supposed to be grounded separately?

 

[QualityCarErock 10+ year member]

I would check the woofer, it's possible that you might have a bad coil.

 

[_DjScrew_ 5,000+ posts]

I have never messed with a cap but isn't the cap and the amps supposed to be grounded separately?

x2, that's what i always thought.

 

[maxxguy1 10+ year member]

Are the amps set the axact same. Use a volt meter to set the gains the exact same by reading the ac volts on one then set the other one the same make they are disconected from the sub first.

 

[maxxguy1 10+ year member]

x2, that's what i always thought.

No if you ground them sepretly it defeits the perpass of even having one, you are supossed to ground the amps to the cap then ground the cap.

 

[helotaxi 5,000+ posts]

No if you ground them sepretly it defeits the perpass of even having one, you are supossed to ground the amps to the cap then ground the cap.

A parallel circuit is a parallel circuit. As long as the amp and cap are both grounded to low resistance ground points, it doesn't matter if they are grounded separately, together to the same point or if the amp is grounded to the cap which is then grounded.

 

[Rattlebrain 10+ year member]

I'm trying help my friend install his system...
It starts with Memphis 4g wirng coming from the battery to a 2 fared Memphis Digital Cap. Cap is grounded secure. Two 4g wires coming from the cap. Each lead going to a Memphis Power Referance 1000.1. Two grounds coming from the cap, each connected to the amp. The amps connected to a 12W7. The Rca's are coming from a Alpine CDA-9856 headunit. then a set from one amp to the other amp..

Sounds to me like its not grounded at all..?