2G Alternator not charging on my 1986 F150 5.0

[Socnarftrucks]

Accidentally dropped my OEM alternator and smashed the regulator.  Went to Oreilly's and purchased a remanufactured one (60 A) which included one of the pigtails . I ensured the connections were done correctly and checked the path of the wires all the way to the starter relay; no damaged or frayed wires.

I have a brand new battery and it will invariably die after a couple of hours of use.  Any help would be appreciated, switching to a 3G is beyond my electrical comfort level..... TIA.

[Gary Lewis]

Do you know the alternator isn't charging?  In other words, are you charging the battery at home and then the truck dies after driving?

Do you have a volt meter?

Can you show us a pic of the back of the alternator showing how it is wired?

[Socnarftrucks]

Yes, I don’t believe it’s charging. The trucks battery dies even after fully charged will die after a couple of days and/or a few cranks. If we jump it, it will run but dies after we disconnect the battery.  I have swapped batteries with my brothers truck which is an identical 86 and the same thing happens. Pic of alternator coming up….

[Socnarftrucks]

The two black wires were connected to the black and orange from the harness. The other connector is a yellow/white and green/red from the harness.

[Socnarftrucks]

Forgot to mention that the small white/black wire goes to what I believe it’s the choke connector which is not connected to anything….

[ArdWrknTrk]

"New" (rebuilt) doesn't necessarily mean good!
Was the alternator tested in the store when you bought it?

Gary has sworn off O'Reilly's alternators after the church car came back... twice.

Do you have a multimeter?
Do you have power at the lt gr/red wire with the key in run?

[Gary Lewis]

Yes, I'm not going to buy another alternator from O'Reilly's!!!!  Two out of four were bad, and one was bad out of the box.

[Socnarftrucks]

 No, it wasn’t tested. Yes, there is power to the green/red with the key on. And power to the black/orange without. I’m on my way to the store to have it bench tested (assuming the kid will know how) and/or get my money back.

 

[Gary Lewis]

The testing machine in our O'Reilly's has been down for months.

[ArdWrknTrk]

The twin bk/or wires are connected to battery + through a fusible link.
So you have proven the fuse link is still good.  
With a meter in hand I think I would have tried to force the alternator to charge @ full field (ground here to test)

I've got nothing to say about O'Reilly's, (because there isn't one local to me) but my 2G was nothing but trouble and I'm glad I finally got rid of it.  

[Socnarftrucks]

2 for 2 …..

[ArdWrknTrk]

At least they had a tester that works.
Gary had to get them home and installed to know they were garbage.

Honestly, I'd just buy a new alternator from DB or someone.
It's got to be better than crappy rebuilds from a chain store.

[Gary Lewis]

Are you saying that not only was yours bad but the next one they pulled out of a box was bad????

[Socnarftrucks]

The first one I bought was never tested at the store, so when the issue started, we concluded we had a bad one. The store manager agreed with our assessment and replaced it. The replacement behaved the same way, and I thought the odds of having two bad ones back to back were not good, hence my post on BNF.  I guess my reluctance to believe those replacements were garbage bit me in the derrière. Going in a different direction, probable DB this time. Or maybe a 3G but I need to sit down and read Gary’s instructions. Many thanks!!!!

[Socnarftrucks]

All this happened within a week mind you!!

[ArdWrknTrk]

Does your 1986 5.0 have efi and a serpentine belt?  (I see a V-belt pulley in your photo)

[Gary Lewis]

Wow!  This is unbelievable!  I'm going to post Don't Buy An O'Reilly's Alternator in the main section.

[Socnarftrucks]

The truck is a 5.0 EFI and does not have a serpentine belt. I had to swap the pulley.

[ArdWrknTrk]

The DB 400-14149 is said to be for your application but the rear is clocked 120° further than what you show.  



Amazon would have it to me tomorrow for $104 outright if I order within the next 2:21

[Socnarftrucks]

I’m done with Oreilly, I’ll be ordering the DB. Thanks