More BS Alternator issues I cant figure out

Zack

Zack

Turbo Marauder
At my wits end now, and its really pissing me off.

Reference first post here:
http://www.mercurymarauder.net/forums/showthread.php?t=93121

Had the alternator re-done and the issues it had are gone.
But, it still only makes 12.7 volts.
If I turn all the accessories on it still makes about the same...12.4-12.7

I took the alternator harness off the car and bench tested it....pass.

So, its definitely the car causing this problem.
The owner insists the volt gauge read 14v before bringing it to me.

The tune in the car is the same I've given 10 other members doing an eaton swap, as well as my own customers. I know that's fine.

From the advice of my friend at Ford, I blipped the throttle to WOT from idle and datalogged. Doing this should send the alternator into full field. However, the voltage stayed the same.
(yes the alternator is programmed to stay on at WOT)

The only wiring I touched was IAC, TPS, EGR and MAF. All of them are reporting properly via datalogging. And there are no engine codes.
The engine runs good and makes 20in of vacuum.

Since I don't have a wave form tool, I can't monitor if the pcm is talking to the alternator and telling it to make volts.

This is so frustrating and its now cutting into my life and wallet.

I have no clue as to how I should proceed. :bigcry:
 
You probably let a small amount of the magic smoke out of the PCM. Not all of it, just a small portion of it. Now all you have to do is stuff it back in the PCM.
 
Has the new battery been bench tested?


Self proclaimed Builder Of Badassery.

Buy it, Break it, Build it BETTER.
"Since 2004"
 
martyo said:
You probably let a small amount of the magic smoke out of the PCM. Not all of it, just a small portion of it. Now all you have to do is stuff it back in the PCM.
Click to expand...

You're cute.

It is pointing to that, but I just can't understand why.
 
Cars suck. Hope you find your problem. I have nothing to add except the magic smoke concept........ because I am sure you have checked and double checked everying..........good luck and keep us posted.
 
Really weird, look at the terminals at the alternator, what is the voltage output at the alt?, check for voltage drop, ie battery terminal wiring may have a green monster, also check the battery ground cable the little one that needs to be grounded really good.
 
hotford said:
Really weird, look at the terminals at the alternator, what is the voltage out out at the alt?, check for voltage drop, ie battery terminal wiring may have a green monster, also check the battery ground cable the little one that needs to be grounded really good.
Click to expand...

Its all new, and crimped/soldered by yours truly.
 
Stupid question......... did you check for a draw on the system while everything is off?????? Worth checking if you havent already.
 
In my tiny world I have found 2 things...
Not all new stuff works
Not everything sends data even when malfunctioning.
simplest thing is to reinstall the 4 new parts (one at a time) with old one and rerun the analysis...4 times. They are super easy parts and it would potentially eliminate that.
Cant hurt. Unless you bang your knuckles on the EGR.
 
I have looked over the wiring, and swapped in a different alternator from my own car. Same stuff happens. It's not the parts
 
I'll pull the PCM harness tomorrow and check continuity from the pigtail to the PCM connector.
I 'suppose' the plenum could have been tightened down over the wiring harness without my knowledge, (causing a break) but highly unlikely. I'll check that too
 
Zack said:
You're cute.

It is pointing to that, but I just can't understand why.
Click to expand...

Wasn't it you who said the alternator was putting out close to 18 v.? That is close to the threshold for magic smoke.

If you do swap the PCM, don't forget about your friends named PATS.
 
Zack said:
I'll pull the PCM harness tomorrow and check continuity from the pigtail to the PCM connector.
I 'suppose' the plenum could have been tightened down over the wiring harness without my knowledge, (causing a break) but highly unlikely. I'll check that too
Click to expand...

Do you have access to a WDS?
 
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