Matt Young

The above description is pretty correct. The main reason why the voltae is low at idle. is because at that RPM a high output alternator usually doesn't put out much amperage. Bring the RPMs on the motor up and see if the voltage comes up. You can tell if the belt is slipping by carefully feeling the temerature of the alternator pulley after the vehicle has been running for a while under a heavy electrical load. If the alternator pulley is noticibly hotter than the rest of the alternator, or if it looks discollored or black on the belt contact area, you have a belt slip problem. Changing the oil has ABSOLUTELY nothing to do with an alternator or belt slip problem.

Sent you a PM. We have 250 amp unit for 2006 4.6.

There is no way you can get much more out of the stock sized alternator. An "overwound" alt in the stock case will actually have less output at idle. Adding more batteries will decrease the amount of voltage drop under a load. You will have to be mindfull of keeping them charged up with your intellicharger, other wise that little alt. will smoke itself trying to keep them charged. You could also put an overdrive pulley on the alternator to boost the idle output a little bit.

No, you will not have that problem on an 02.

If you run an Isolator, you will loose the reduced voltage drop benifits of running the batteries in parralel. I wouldn't reccomend one for this type of application.

Contact this guy: [email protected] He has a very reasonable dual alt kit that also ghas a provision to get around the low voltage issue on the '04 and up vehicles. I have been very pleased with his service and products. They actually just did a similar setup on Jamie Fox's Escalade.

Grounding to the chassis will work, but depending on the current draw, a copper 0 gauge cable could be a better conductor. Unless you are competing, I wouldn't worry about it. BTW, it is OK to mix battery types, and it won't be any harder on the alternator than adding an extra battery of any other type.

Sent you a PM

Our 200 amp alternators are usually about $400 and come with a warranty and a dyno sheet.

A D2400 or larger in the trunk and a 200 amp alternator with good idle output. Let me know if you would like a price quote on the battery and alternator. [email protected]

That is a correct explaination. A cap won't welp much- you need a bigger alternator. Let me know what the vehicle is and I can quote you a price. [email protected]

www.xspowerbatteries.com D925 FTW!