PMW woes

[HOTRODTECH]

I have 2008 GM vehicle with a pulse width modulated alternator that puts out 150 amps under load,

all my grounds are 4 gauge high performance wired (engine to chassis, battery to engine) I am running a 20 farad hybrid cap, Optima AGM red top battery powering an Alpine PDX 1.1000 sub amp, Infinity Cappa 4 effects amp, 12" Alpine X series subwoofer run through an Audison Bit 10D digital sound processor. When I first start and drive the vehicle it doesn't matter how much bass I run through my sub, the voltage stays steady at around 14.2 volts....once I drive for a while the

pulse width modulated alternator scales back the voltage and does not react to the change in voltage quickly enough to provide the voltage required to keep my system operating as it should. I would also add that I have under driven my alternator to alleviate the lack of charge at idle. How do I get around the computer control of my alternator.....nobody seems to know.

Click to read more...

 

[los33 10+ year member]

All you need is a new alternator regulator.

Bigfer companies like xs power and alternator makers have some that bypass the bcm to allow steady voltage.

Your alternator can charge steady at 14.8v no problem with a regulator

Sent from my Z970 using Tapatalk