Get this...when driving in my truck and I floor it the volts drop from 14.5 to 11 and the engine loses a ton of power too. If i back off about 1/2 way the volts jump back up along with the engine power. I checked the belt and its ok. Any ideas?

2002 Chevy 2500 hd cc sb pewter 6.0 4.10
nitto terra graplers 285/75/16, piaa airdam w/lights, smitty bilt outland sport bumper w/ 4 kc daylighters,200 amp powermaster alternator, dynamat,alpine hu, boston pro 6.5, jl audio 500/5 amp, jl 12w0, optima red top, airaid, custom exhaust, line x

 

It might could be your alternater.

 

Yeah the aftermarket alternator could be the problem.

 

I was thinking that too but want to see if anyone had any other ideas before I put the stock one back on

 

You could have a faulty TPS (throttle position sensor).

Either that, or the General gave you an extra strong dose of Torque Management. <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" />

I think I would have a shop check it out.

 

OK fuel filter changed and alternator back to stock. Volts dont drop now and doesnt bog as bad but it still feels extremely restricted. Kinda like a clogged shop vac hose. Any more ideas?

 

well i think we found the problem. Ran autotap and found that the truck only has 11.5 degrees of timing at wot. removed the maf screen and got it up to 13.5. Anyone know of anything else to get more timing untill I get lsi edit?