Electrical 1988 Mustang 5.0 GT Charging Problems

What about the white wire ? Does it go from the 3 wire connector to the single wire pin on the alternator body.

You really need to run the one single heavy gauge wire over to the battery side of the car. I have read some horror stories of guys burning their cars down keeping the two wire setup. And when I did my upgrade I never saw 14 volts from the alternator until I put the Yellow wire directly on the post on the back of the alternator for it to see voltage, then I got 14. Before that it was putting out 11. something. Maybe not ideal but it worked. Do you have 14 coming out of alternator now?

BradyB1999 said:

That’s good to know. Even through the instructions said it want necessary it might just be worth doing. I haven’t measured voltage out. When the car is running that would be the bottom post with the black wires that would tell me output?

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Yes, I hooked the trigger wire to the main output post and finally got 14 volts. I bet your only getting 11 from the back post right now. Move that wire and see if it goes to 14.

Run the power cable straight from solenoid to the alternator.

Yes ditch the 2 power wire set up back to starter solenoid. A simple source for the 4 gauge power wire is the 99 and up Windstar and 04-07 Freestar minivans. Their alternator is on passenger side as well, they use a 135A 6G alternator and have the power going directly from alternator power bolt to battery post (battery side of starter solenoid is the same). That's what I did with mine.

You might have an EEC issue as alternators are controlled by the EEC but I strongly feel the alternator body isnt properly grounded but looking at the picture it seems sorry to say the whole alternator is installed;- Mostly wrong.....

For those who think the EEC has no bearing on charging heres a snapshot...



To do the job right you should of totally did away with everything from the side of the alternator to the battery and ran a solid 4 ga fine strand welding cable with a copper lug attached and hooked it direct to the battery with a same amperage fuse...Those split power coarse copper wires are gonna melt and start a fire........

You can get a 3ft 4 ga battery cable with copper lugs on both ends for $10 bux at AutoZone

Butt connectors are never a good idea when bumping up the amperage...I solder all my connections with silver solder and use shrink wrap..

Another thing you needed to do was to totally remove the alternator bracket from the engine and clean up where it mates together with the engine block and to clean up the slider joint that tightens the alternator with side pressure too as these are the alternators ground path..

Good grounds are important...I run my grounds from battery to engine block , engine block to frame and engine block to starter then battery to core support

This pic os an old pic before I did the 3g alternator upgrade but have crappy pics of the process too...



Plus the alternator body has a screw on the back that needs a dedicated ground going from the alternator body to the battery negative cable or the battery frame too..

Heres a crappy shot,,,The baby blue shrinkwrap is the alternator body ground...


The thick red going to the supersized battery terminal is coming from the alternator.....I have pics w/ the noise filter somewhere..LOL



I have my negative coming from the alternator going to the sidescrew on my NewMar alternator noise filter I have installed between the alternator and the battery with the noise filter body grounded to the frame..My tuner says in all of his years tuning EEC systems mine is the most stabile with way less interferrence and noise spikes..

Good Luck

In addition to eliminating noise and errant voltage spikes I use some simple clip on devices called ferrite bead Chokes and I also invented my own system aswell

It seems anistropic crystals filter out EMI radiation and R/F interferrence so I made my own grounding system that pulls the pollution out of the system and neutralizes it...............LOL

Its been a breakthrough discovery since 2016 and talk amongst the quantum physics crowd since the because it took means of destructive methods to neutralize them before....LOL



Theres alot more than meets the eye with these hand fabbed copper busbars...Inside each is a meld of smelted precious metals with precise percentages only known to me and soon after approval will be standard equipment in veryday vehicles to eliminate people from the harm of radiation.........

What most dont realize is that standing too close to that harmless looking alternator isnt so harmless...With my system it is....LOL




Good Luck and take care..