voltage drop/lights dimming issue with bad grounds?

[Guinelle1 10+ year member]

hello guys. im really stumped on how to fix this light dimming/voltage drop i get from my truck. its a 2000 chevy silverado 1500 with the 5.3l v8. i only have 4 10 in p1s which is only 600 watts rms. i have two RF 201s amps for the subs and one RF prime r150-2 for the front door speakers. ive done the big 3 with 0 gauge wire and have a DC power 190 amp alternator. i thought the alternator would fix the problem but it hasnt seemed to do much. the volts definitely jump right back up though. i think there may be something wrong in the system that is drawing too much power? also when i both my windows up at the same time i get a LARGE drop in volts that dim my lights. please help me! i thought my stock alt would be able to handle these subs but clearly not.

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[LosIsATool 5,000+ posts]

have you checked the battery? If its good then check your grounds

 

[Guinelle1 10+ year member]

the battery is only about a month old. ive checked all the connections and all my grounds are good both of the big 3 grounds go directly to a spot on the frame rail

 

[i2ain2thunder 10+ year member]

Sounds like bad grounds to me somewhere, the voltage shouldn't just drop and jump up. If your grounds are good for sure then you need to buy a better battery or multiple batteries. Everytime I get this problem it gets corrected when I purchase enough decent batteries.

 

[T.I.K. 10+ year member]

the battery is only about a month old. ive checked all the connections and all my grounds are good both of the big 3 grounds go directly to a spot on the frame rail

Did you charge the battery before you put it in?

 

[Guinelle1 10+ year member]

Did you charge the battery before you put it in?

no i did not charge it. should i put a charger on it?

 

[Guinelle1 10+ year member]

does anyone else have any other input on this? otherwise i think im going to do a dual battery setup. :/

 

[09civic 5,000+ posts]

you dont need two batteries for 600 rms.

 

[Chriszle 10+ year member]

190 amp alt should support what your running with little to no drop at all. I would triple check all your wiring.

 

[serjr711. 10+ year member]

You're running 3 amps. Get a kinetik or stinger battery. Nothing too large. That alt only put out at best 105 amps @ idle.

 

[audiolife 5,000+ posts]

Check the big 3 and check your grounds on the amps and pay attention to and distribution blocks in the set up.

 

[grandam888 10+ year member]

yeah this is a wiring issue. even if your getting 100 amp @ idle you should still be fine with this small of power usage. i would put a bet on battery/alternator ground. positive wiring.

but triple check ALL wiring you have touched pertaining to power system. and also double check your running a compatible load on the amps.