Alternator?

[Ourobos]

Seems mine is only putting out about 12.9v. Is the alternator the culprit? Any good suggestions for a replacement if so? Measured voltage while on dyno today.

[Logizyme]

Typical Marauder. Its normal.

[fastblackmerc]

Should be putting out over 14V. Take to any FLAPS and they can test the charging system.

If it is the alternator make sure you get a "4G" style. Mustang ones look right but won't work.

[Ourobos]

I agree it should be around 14v, at 12.9v my fuel pump hit 100% at 6000 rpm. I'll see what NAPA has.

[ChiTownMaraud3r]

Make sure the alternator case is grounded well. Known problem with the coated brackets when doing the eaton swap. Cost me some money learning the hard way..

[Ourobos]

^ Excellent, will do.

[Ourobos]

May be a silly question.. But with the eaton swap, flipping the alternator backwards, it turns the opposite direction as stock no? It should still produce full charge if so?

[ChiTownMaraud3r]

No difference in charging. Some have been known to go bad right after reversing the direction, requiring a re-build, others not.

[Ourobos]

Probably what happened to mine if not a ground issue.. I'll figure it out Saturday, thanks again.

[FordNut]

May be a silly question.. But with the eaton swap, flipping the alternator backwards, it turns the opposite direction as stock no? It should still produce full charge if so?

Just have to change the pulley.

[Ourobos]

Right, from clutched to standard type pulley, which was done.. But the alternator still spins the opposite (CCW) direction. I'll find out Saturday if it's the ground or actual alternator issue.

[Zack]

Right, from clutched to standard type pulley, which was done.. But the alternator still spins the opposite (CCW) direction. I'll find out Saturday if it's the ground or actual alternator issue.

You know the alternator stops output when at WOT right?
Your tuner needs to program it to stay 'on' when at wide open throttle.

[babbage]

You know the alternator stops output when at WOT right?
Your tuner needs to program it to stay 'on' when at wide open throttle.

Everyone always seems to forget this. I think it's damn dangerous.. Passing someone at night with radio, a/c and lights on is damn scary with factory programming...

Have the 160amp alt which stays on all the time (custom Dyno tune) Especially at WOT

[RubberCtyRauder]

Why would you need WOT at night to pass ? Stepping on the gas isn't enough? Need to go full bore open?

[Zack]

Why would you need WOT at night to pass ? Stepping on the gas isn't enough? Need to go full bore open?

Don't be that guy

[babbage]

Why would you need WOT at night to pass ? Stepping on the gas isn't enough? Need to go full bore open?

Yeah you are right I should linger in the left lane with possible on coming traffic as long as possible..

Sorry not a Prius style driver, that and the fact that most drivers will accelerate when being Overtaken.

[Spectragod]

Why would you need WOT at night to pass ? Stepping on the gas isn't enough? Need to go full bore open?

Passing = another chance to go WOT..... They didn't teach you that in driver's ed???:D

[Ourobos]

Not sure if the tuner knew, I will have him check and send me an updated tune if not, thanks.

Regardless, it's only showing 12.8-13.0 sitting idling on my volt meter, even with some throttle as well... Still low no?

[RubberCtyRauder]

Not a Prius driver either. Just don't see The need for WOT when just under WOT is more than ample . Unless you like to drive balls to the wall stoplight to stoplight or wait til last minute to get in the lane you need to exit etc. I see them everyday to and from work. So doing 75 in a 55 is ok with you I assume

[Spectragod]

Not sure if the tuner knew, I will have him check and send me an updated tune if not, thanks.

Regardless, it's only showing 12.8-13.0 sitting idling on my volt meter, even with some throttle as well... Still low no?

Should be at least 14.0 volts @ idle with just the car running, sounds like the alternator is going bad.

[Ourobos]

Thanks Spectra, going to make sure it's not a bracket ground issue, then order an alternator if not. Will be on it tomorrow troubleshooting.

[8UWITH6]

Run another ground from the alternator case to the battery you will laugh when the voltage jumps.

[Zack]

Have the alternator rebuilt at a local shop, it's much cheaper and usually better than a store bought

[larryo340]

My alternator went a few weeks ago and I put in a reman Ford unit, I'm on the second one from them, and it still has crazy voltage swings...waiting for a third one from them. If that doesn't work properly I'm going to get a DB electrical unit that's recommend here.

[justbob]

My alternator went a few weeks ago and I put in a reman Ford unit, I'm on the second one from them, and it still has crazy voltage swings...waiting for a third one from them. If that doesn't work properly I'm going to get a DB electrical unit that's recommend here.


My DB unit lasted exactly a year and fell on its face.


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[martyo]

Did you re-use your existing alternator when you did the Eaton swap?

[larryo340]

My DB unit lasted exactly a year and fell on its face.


Sent from my iThrone using Tapatalk

That's not good, was it the stock amperage one?

[babbage]

Not a Prius driver either. Just don't see The need for WOT when just under WOT is more than ample . Unless you like to drive balls to the wall stoplight to stoplight or wait til last minute to get in the lane you need to exit etc. I see them everyday to and from work. So doing 75 in a 55 is ok with you I assume

I don't always do WOT at passes, but when I do I like to have full voltage.

You know what they say about assumptions... ;)

[Ourobos]

Did you re-use your existing alternator when you did the Eaton swap?
I did indeed Marty.. Put the non-clutched pulley on it and flipped it. Any reason you ask?

[babbage]

My alternator went a few weeks ago and I put in a reman Ford unit, I'm on the second one from them, and it still has crazy voltage swings...waiting for a third one from them. If that doesn't work properly I'm going to get a DB electrical unit that's recommend here.

Another thing to check is your ground wires, without a good ground any alternator will have trouble. File ground connection and mating surfaces clean and shiney

[justbob]

That's not good, was it the stock amperage one?


Yes.


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[FordNut]

So doing 75 in a 55 is ok with you I assume
Absolutely...

[FordNut]

My DB unit lasted exactly a year and fell on its face.


I've been through 3 of them, the regulator has always been the problem. Mine were the high output ones.


My alternator went a few weeks ago and I put in a reman Ford unit, I'm on the second one from them, and it still has crazy voltage swings...waiting for a third one from them. If that doesn't work properly I'm going to get a DB electrical unit that's recommend here.

The crazy voltage swings are because they used the wrong regulator.

[FordNut]

Did you re-use your existing alternator when you did the Eaton swap?


I did indeed Marty.. Put the non-clutched pulley on it and flipped it. Any reason you ask?

Just a guess, maybe he's trying to figure out the timeline of when the problem started.

After the Eaton swap, did it ever work correctly with the original alternator?

[RubberCtyRauder]

Absolutely...

Why stop at 75 then, why not 80,90,100....Im not a putz driver who hugs the right lane and impedes traffic. Just don't see the need for blatant 20+ over the speed limit. See far too many close calls because one was going way over the limit and darts about causing brake lights behind all the time as they squeeze into a space all awhile they are oblivious to the **** they caused. Yapping on their Bluetooth or shoving fries in their face. When they are the side of the road with the blue lights pulled up behind them or in a ditch on a snowy day..I LMAO when going by and wave.:banana:

[FordNut]

Why stop at 75 then, why not 80,90,100....

Sounds good to me...

[Ourobos]

Whomever suggested the extra ground, thank you kindly. I ran a 6 gauge wire from case to ground, 14.3v now.

[FordNut]

Whomever suggested the extra ground, thank you kindly. I ran a 6 gauge wire from case to ground, 14.3v now.

Thanks for the update.

[RubberCtyRauder]

Sounds good to me...


Whatever, see ya on the side of the road

[Zack]

Jerry strikes again!!!!

[8UWITH6]

Whomever suggested the extra ground, thank you kindly. I ran a 6 gauge wire from case to ground, 14.3v now.

That was me and your welcome. Yes, its Jerry's fault. But we love him because he supplies us with baddass stuffs to make Marauder's go vroom vroom.

[03blackvegas]

Why would you need WOT at night to pass ? Stepping on the gas isn't enough? Need to go full bore open?

There's passing, then there's stomping the daylights out of some poor slob, the time of day is irrelevant.

[RubberCtyRauder]

There's passing, then there's stomping the daylights out of some poor slob, the time of day is irrelevant.

I'm not the one who brought up passing at night. When they hit a deer at 90 or are pulled over and ticketed. I don't give a ******.

[martyo]

I did indeed Marty.. Put the non-clutched pulley on it and flipped it. Any reason you ask?

I see you solved your problem with an additional ground. We use the extra ground regularly but we have found an inordinate number of alternator failures when they are flipped around for the Eaton swap.