• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

1986 Ranger 2.9 Alternator Wiring


kxri318

Member
Joined
Jan 31, 2023
Messages
90
Reaction score
23
Points
8
Location
Ohio
Vehicle Year
1986
Make / Model
Ford Ranger
Transmission
Automatic
Just bought an alternator off rock auto to replace my current one and saw the new alternator has 3 wires (two black and one smaller white) while my current wiring harness only has the 2 black w/ orange stripe wires. The actual connector on the harness has 3 slots, but doesn't seem to use the third. I've seen some pictures of other people's trucks where it does have a third white wire coming from the connector, but mine doesn't seem to. The only info the alternator came with that says anything about wiring is a piece of paper that mentions "The heavier wires (black w/orange stripe) both return current to the battery. Therefore, they can be interchanged" I also saw that in the diagram, the white wire apparently goes to the voltage regulator but there's no white wire on the regulator connector on my harness. What does the white wire do and do I need it?

20230908_175834.jpg
20230908_175721_HDR.jpg
 


franklin2

Well-Known Member
Joined
Dec 24, 2019
Messages
3,294
Reaction score
1,648
Points
113
Location
Virginia
Vehicle Year
1984
Make / Model
Bronco II
Transmission
Manual
You have the famous 2G alternator. That connector you have in the original harness with the two orange/black wires was famous for melting and catching fire. So the aftermarket got rid of the connector, you have to hardwire the two orange/black wires to the two new black wires on the alternator. They where the fire starters.

The white wire is the stator wire. Some setups used it, some didn't. Engines with carbs used it to to run the electric assist chokes. Some of the later alternators had 3 wires on the regulator, the third wire you do not have on the regulator is where the white wire goes.

I would leave the white wire disconnected, just tape it so it's not touching anything. If you have problems and this aftermarket alternator does not charge correctly, you can get new wiring plug/pigtails for the regulator that do have the third wire on them. And then you can hook the white wire to that.
 

kxri318

Member
Joined
Jan 31, 2023
Messages
90
Reaction score
23
Points
8
Location
Ohio
Vehicle Year
1986
Make / Model
Ford Ranger
Transmission
Automatic
You have the famous 2G alternator. That connector you have in the original harness with the two orange/black wires was famous for melting and catching fire. So the aftermarket got rid of the connector, you have to hardwire the two orange/black wires to the two new black wires on the alternator. They where the fire starters.

The white wire is the stator wire. Some setups used it, some didn't. Engines with carbs used it to to run the electric assist chokes. Some of the later alternators had 3 wires on the regulator, the third wire you do not have on the regulator is where the white wire goes.

I would leave the white wire disconnected, just tape it so it's not touching anything. If you have problems and this aftermarket alternator does not charge correctly, you can get new wiring plug/pigtails for the regulator that do have the third wire on them. And then you can hook the white wire to that.
Alright, thank you
 

Sponsored Ad


Sponsored Ad

Staff online

Today's birthdays

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Yotaismygame
February Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top