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2G Alternator not charging on my 1986 F150 5.0

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ArdWrknTrk

Re: 2G Alternator not charging on my 1986 F150 5.0

Administrator

Do you understand how to reclock it if need be?
I do believe that this alternator is in the proper orientation for pickups already (but I'm not looking at your truck)

I think there are instructions in the 3G update tutorial (much the same)
But you should determine that before you go to swap the pulley, because you need to do that anyway.

Remove the pulley.
Remove the three bolts that hold it back to front.
Tap lightly on the shaft *just* until the cases separate enough that you can rotate the rear housing 120°.
Be very careful that you don't dislodge the brushes from the commutator!!!!
Reinstall the bolts.
Install the V-belt pulley you need.
Done.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Socnarftrucks

Re: 2G Alternator not charging on my 1986 F150 5.0

Oh! I didn’t know that. Thanks for the heads up. I will make sure and follow your instructions and recommendations on the re-clocking.

ArdWrknTrk

Re: 2G Alternator not charging on my 1986 F150 5.0

Administrator

See how your power wires are pointing directly up (12:00) in relation to the adjuster ear of your 2G?

See how the one pictured on Amazon is pointing at 04:00?

On my truck the adjuster ear is pointing down and i probably want my alternator clocked like yours is, so the regulator plug is not facing the engine block.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Socnarftrucks

Re: 2G Alternator not charging on my 1986 F150 5.0

In reply to this post by ArdWrknTrk

Installed the DB alternator a little a week ago. No issues whatsoever, the truck is running fine. And it has maintained an12.3-12.6 V which seems low to me when compared to my 95 f150’s 13-14 V

ArdWrknTrk

Re: 2G Alternator not charging on my 1986 F150 5.0

Administrator

That does seem low.
My 3G shows 14.3-14.5 at the battery once it settles down.

I have a later cluster with integral volt meter and that shows a pinch over 12.
I also have a white LRC regulator which delays response for a couple of seconds and then ramps the output.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: 2G Alternator not charging on my 1986 F150 5.0

Administrator

In reply to this post by Socnarftrucks

I agree - 12.3 to 12.6V while running is low. Something is wrong.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

Socnarftrucks

Re: 2G Alternator not charging on my 1986 F150 5.0

Parasitic draw? How do I check?

85lebaront2

Re: 2G Alternator not charging on my 1986 F150 5.0

Administrator

First thing I would do is put your hand around the harness on the right fender, both in front and behind where the alternator harness with the engine running, if it feels hot, then you have a high resistance connection and it needs to be found and repaired.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413