Thread: The alt rewire mod actually DOES increase fuel mileage!!

I have the alt booster and rewire. Can't comment on how it affects mileage since I made other changes at the same time. But the electrical system does seem more healthy. I also took my battery's ground and sanded/cleaned it. I plan on replacing it, as well as the engine->chassis ground cable. The Big 3 would be complete.

In regards to topping off, I had heard that it was harmful for a while. Then, while I worked for a Pontiac/GMC/Hummer dealership a couple years ago I asked the service manager about it. He was adamant about letting the cut-off do its job. He said several times weekly they replaced evap canisters or otherwise serviced the evap system from problems caused by overfilling. Plenty of GP's were in there.

I'm not saying you might have an issue, but in the grand scheme plenty of people aren't doing it right. Just a word of caution, I guess, to everyone else.

does anyone have pics of the alt. rewire installed ? i know this is probably a very stupid question but i dont want to install this wrong . from what i think i remember seeing you basically hook it up to the +alt. to the +on the fuse box but i dont remember if you are suppose to remove the other 2 wires or leave them installed ? so the question is do i remove those wires or leave them in ?

there is nothing to the alt rewire. You can go to easyperformance.com an see the install instructions. One end goes under the positive nut on the alternator along with the stock one, and the other end gets put under the not on the fues box. Piece of cake. Yes all of the stock wires stay in their stock location.

__My point about dropping the voltage that far is that it is just plain rediculous. You are then operating outside of it's designed lower limits and proves nothing as a result. Same goes for stepping up the voltage too far.

In case you haven't followed the many V boost and alt rewire threads, it is a mixed bag of reviews. Like I said it is a good thing, but your results may vary. Why some see no appreciable results others see big results, and a handful for some reason, bad results, is beyond me. Note that I have the alt rewire, fuel pump rewire, and the stage 1 Volt booster.

Originally Posted by IndeedSS

there is nothing to the alt rewire. You can go to easyperformance.com an see the install instructions. One end goes under the positive nut on the alternator along with the stock one, and the other end gets put under the not on the fues box. Piece of cake. Yes all of the stock wires stay in their stock location.

ok so on easyperformance it says to leave all stock wire connected but does that mean have them both connected or should i just have the new wire hooked up to the alt ??