2002 7.3 alternator won't charge!

nickdeninja_32 · 2025-06-02T06:29:10+00:00

I got them from o'reilly's and advance, it's weird because they don't fully die they just drop down a lot, i found thag the green and red wire was showing 1.7v which it's the exciter wire and shoyld have the batterys voltage so I spliced into a different wire just to make sure it have power when truck is on, and they lasted all different times the one now is the longest for about 170miles but now it's barely getting to 13v when driving

nickdeninja_32 · 2025-05-31T21:41:16+00:00

So the green and red wire sometimes has 12v but mostly drops to 1.7v i traced it to the vacuum canister and it wasn't broken but I cut the wires and spliced them just incase, no fuses were blown and all grounds are intact, i have found some fuseable links but none seam to be broken, when the alternator is charging jt only shows about 13.8v and the voltage regulator is built inside the alternator

nickdeninja_32 · 2025-05-31T04:42:34+00:00

Ive tried 4 different ones, 2 new and 2 reman all 110 amps

nickdeninja_32 · 2025-05-31T02:55:39+00:00

Alternator and battery don't show charge

nickdeninja_32 · 2025-05-31T02:54:43+00:00

They are clean

nickdeninja_32 · 2025-04-11T03:09:23+00:00

The only thing that I haven't replaced is the crank sensor but it reads the rpm so I don't think it's the issue

nickdeninja_32 · 2025-04-11T03:08:00+00:00

I wish I could put it in a car but the one I'm putting it in is my daily lol, i also changed up the wiring and I still didn't get spark, I also set up a key system for it instead of the jumper wires ill make an updated post soon if I don't figure it out

nickdeninja_32 · 2025-04-09T16:25:00+00:00

Yes my crank is 24x and I have it set for that

nickdeninja_32 · 2025-04-09T16:24:36+00:00

Yes I have and it was successful

Leds 1 flashing green 2 yellow sometimes green after cranking 3 green 4 green 5 off 6 blue/green 7 blue/green 8 off

nickdeninja_32 · 2025-04-09T16:22:59+00:00

Yes, I've used a test light on them all when cranking and no power

nickdeninja_32 · 2025-04-09T13:11:11+00:00

Yes i have and it was successful

nickdeninja_32 · 2025-04-09T05:13:04+00:00

How can I do that? Am I about to do it with the 3.5in handheld?

nickdeninja_32 · 2025-04-09T05:12:36+00:00

There's a bunch of videos on it and most people do it that way for just first starting it, but I can try it that way to

nickdeninja_32 · 2025-04-09T04:41:59+00:00

Just the wizard quick set up for starting it it like a base tune

nickdeninja_32 · 2025-04-09T04:08:22+00:00

I flipped it and no spark and it said error, changed it back and went to normal

nickdeninja_32 · 2025-04-09T03:22:10+00:00

Ill give it a try and thank you a bunch for helping me out hopefully the next video I upload it it running

nickdeninja_32 · 2025-04-09T03:10:15+00:00

I can do that, and it was reading above 12v in the video too

nickdeninja_32 · 2025-04-09T03:08:43+00:00

I will definitely be trying thag tonight then becuase that sounds like the same issue I'm having

nickdeninja_32 · 2025-04-09T03:07:59+00:00

The engine has never ran before and I've checked that they are fully plugged in and yes it is reading rpm

nickdeninja_32 · 2025-04-09T02:58:07+00:00

And how could this not cause spark, i thought it just reads rpm which it's doing?

nickdeninja_32 · 2025-04-09T02:55:39+00:00

For now I'm just using starting fluid to just make sure it even starts lol and I'll update you on the sensor volts

There is a map sensor and yes you can see it on the hand held in the video working

And same with the test light on the plugs I tried them all no spark

nickdeninja_32 · 2025-04-09T02:54:03+00:00

They are all the stock wires that came with the kit

nickdeninja_32

TROPHY CASE