tuff truck alternator wiring

oregon4wheeler · Mar 7, 2014

my grandson is building a tuff truck from a 87 ranger. took out 4 cylinder and put in 2.9 will all items from other truck. Truck runs great and has lots of power. BUT the alternator is not charging. Tested old and it showed good. Test another used one and it was ok but neither will put out a charge when installed. Bought a new alternator and same thing. Most of the dash and excess wiring is torn out of truck. So I want to just rewire alternator to battery only I can not find good wiring diagram to tell me where the wires in the harness that plug into alternator lead to. The alternator has an internal regulator so there are 2 plugs one at regulator and one lower on alternator. both have 3 wires. So how can I by pass all and wire alternator directly???

Earl43P · Mar 7, 2014

http://www.therangerstation.com/tech_library/EDiagrams/files/Diagram_charging_1991_1.JPG

I realize that this schematic is not for your year, BUT - it does show that the light/resistor in the dash cluster has to be connected or simulated in order for the alternator to produce voltage.

You are not the first to encounter this.

Actually, after re-reading your post, you need THIS diagram (and a 50 cent 510 ohm resisitor) to make it work.

http://www.therangerstation.com/tech_library/EDiagrams/files/Diagram_charging_1991_2.JPG

Rowdy Fitzgerald · Mar 7, 2014

What year is the donor 2.9 and wiring harness?

Rowdy Fitzgerald · Mar 7, 2014

Here is the wiring diagram for a 86-88 ranger.

[/URL]

This is a 89 ranger.

[/URL]

Twister · Mar 7, 2014

Don't know if it would be option for you, but a 3g alt swap would be extremely simple. One one wire to the alt and a battery cable to the starter solenoid and your good to go.

http://www.therangerstation.com/forums/showthread.php?t=138592

Sent from my SPH-L900 using Tapatalk

alwaysFlOoReD · Mar 7, 2014

I merged two threads together so there might be something here that doesn't make sense. Sorry for any confusion but there should only be one thread for a topic to prevent duplication and confusion.

Richard

tuff truck alternator wiring

oregon4wheeler

New Member

Earl43P

Well-Known Member

Rowdy Fitzgerald

Hog hunter

Rowdy Fitzgerald

Hog hunter

Twister

Active Member

alwaysFlOoReD

Forum Staff Member

Sponsored Ad

Sponsored Ad

Staff online

Members online

Today's birthdays

Member & Vendor Upgrades

Latest posts

Truck of The Month

Recently Featured

Follow TRS On Instagram

Latest Album Photos

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store

Sponsored Ad

Sponsored Ad

Sponsored Ad

Amazon Deals