1990 c2500 voltage drop

[Dodge/Chevyman]

I need help with my 1990 Chevy C2500 350 5.7l v8 i have had it for about 3 months now and before i got ahold of this truck the previous owner was having problems with it just as much as i am now, 1. If i get into the throttle to hard it will fall on its face, i have changed the distributor cap, rotor, speak plugs and wires it has helped a little bit but still acts up, 2. i just put a 10 in sub powers by a 600w fosgate with a jensen VX4012 when the bass drops really good the voltage drops i tested the voltage at the battery, alternator and right at the sub, there is not drop at the battery or alternator but at the amp it will drop as low as 11v, 3. when i use my lights at night or turn signals i get a drop and my truck has a hard time staying running at night with the lights on. What can i do to prevent this big voltage drop.

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[C1500martin 10+ year member]

Check egr, mine was doing that and i cleaned it out and problem solved. As for the voltGe these trucks factory electrical is horrible the alt charges at 13.4. You need to upgrade the wires and do big 3 atleast.

 

[Dodge/Chevyman]

thank you for the info i will be looking that up and seeing what i can do about that, and i was going to do the big 3 when i got the money for the wire.

 

[frogcase2002 10+ year member]

Where is your amp grounded?

 

[Dodge/Chevyman]

i have it grounded to the frame of the seat.

 

[frogcase2002 10+ year member]

Could be a problem. Causing voltage drop