mechman not charging

[juanmgarza26 10+ year member]

So I haven't been on for a while I was in a car accident today I was able to get some energy to get started on my truck again, first thing was first, the alt, mechman 270, got it hooked up and wired up with big 2 ran my power cables today and when I turned on the truck the voltage stayed at 12.7 baffled, so I figured I take out my amp and put a load on the electrical system to seeaybe 12.8 was going to be my charging voltage, nope the voltage dropped and got no higher again, the factory alt had the 3 pin oval with an extra yellow lead from the factory harness, I've looked for what this wire is connect ted to and can't find anything

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[SounDrive Pro Seller]

How is your alternator regulated?

 

[Silverado SS 10+ year member]

Thats a good question I know on some focuses they charge around 13.2 due to engine management so that may be the culprit

 

[bgowdy 5,000+ posts]

you may wany to check that front battery. if its bad it could be acting as a load on the alt, i had this same problem and it turned to be a bad batt. i took it out and never had the issue again

 

[03F150MrSBF 10+ year member]

On my singer I didn't need to use that yellow wire. On stock, it's a jumper, and on the ho alt, I had 3 wires, but Mike told me on mine I didn't need it since it's hooked up another way internally. He had it covered up, but I just wanted to be sure. I have a 03 f150 so I know what 3 wires you mean. I had to cut my stock harness and add the supplied harness.

I know our alts are different but may be similar in hookup.

 

[mylows10 5,000+ posts]

Year make model and engine size ?

 

[juanmgarza26 10+ year member]

Thanks for replies I took my front to get checked its fine, engine is a ford 4.6 v8 center mount alt