• 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.

Tach and volt meter not working, charging system not charging.


Goosered5

New Member
Joined
Sep 5, 2020
Messages
3
Reaction score
0
Points
1
Location
97478
Vehicle Year
1987
Make / Model
Bronco 2
Transmission
Manual
Purchased 1994 3.0 4X4 at really good price 118k org miles. Volt gauge is constantly below 8 volts (needle appears to be bottomed out) and tach is not working. Replaced 7 year old batt and installed reman alt and belt, replace battery cables and cleaned and or replaced ground straps, still not charging, pulled alt and had it tested at local rebuilder, it tests good. Can I please get some advice where to start?
 


franklin2

Well-Known Member
Joined
Dec 24, 2019
Messages
3,354
Reaction score
1,712
Points
113
Location
Virginia
Vehicle Year
1984
Make / Model
Bronco II
Transmission
Manual
Get a voltmeter or testlight. Go to the back of the alternator and find the lightgreen red stripe wire. Somehow poke this wire with the testlight or meter, put your other lead on the negative of the battery. When you turn the key to run but do not start it, you should have 12v on this wire. If you don't, that is a problem.

This wire comes from the cluster and the battery charge light in the cluster.

If you want to try an experiment, you can get a scrap piece of wire and hook it to the lightgreen/red, and then touch it to the battery +. Then it should start charging when the engine is started. This will verify that is the problem. If it is the problem, the next place to look is the cluster. And you might find the reason the tach doesn't work also.
 

Goosered5

New Member
Joined
Sep 5, 2020
Messages
3
Reaction score
0
Points
1
Location
97478
Vehicle Year
1987
Make / Model
Bronco 2
Transmission
Manual
Thanks for the info, I will try that!
 

Goosered5

New Member
Joined
Sep 5, 2020
Messages
3
Reaction score
0
Points
1
Location
97478
Vehicle Year
1987
Make / Model
Bronco 2
Transmission
Manual
Jumped wire to Batt, system is charging. Going to pull cluster and find issue. THANK YOU!
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,292
Reaction score
8,298
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
1994 cluster wiring diagram below
 

Attachments


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


Kirby N.
March 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

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top