Bronco Forum - Full Size Ford Bronco Forum banner

1 - 10 of 10 Posts

·
Use the Force...
Joined
·
968 Posts
Discussion Starter #1
I was driving home and noticed my battery light was flickering on and off. Looked at the voltmeter and it was reading ~15-16v. What's causing this and his do I correct it? It was only doing it when cruising around 2000 rpm.
 

·
Registered
Joined
·
4,871 Posts
Loose battery cables or main grounds (engine and frame)
 

·
Premium Member
Joined
·
520 Posts
I see you have a 3G, could be internal voltage regulator.
 

·
Super Moderator
Joined
·
26,076 Posts
Yo Darth,

As the guys advised; and this is by Ford for a 96, but similar
Section 14-00:
Battery and Charging System, Service
http://www.diesel-dave.com/vehic/manual/stj/stjse00l.htm

PINPOINT TEST B: SYSTEM OVERCHARGES (BATTERY BOILS OVER)

B1 CHECK VOLTAGE DROP IN A CIRCUIT
•Key to RUN.
•Measure voltage between test point A on the voltage regulator and the positive (+) battery post.

Is voltage drop less than 0.25 V?
Yes GO to B2.
No SERVICE excess voltage drop in Circuit 36 (Y/W). CHECK fuse and connectors in Circuit 36 and SERVICE as required

B2 CHECK VOLTAGE DROP IN I CIRCUIT
•Measure voltage at wiring harness I terminal, Circuit 904 (LG/R).
NOTE: Voltage regulator must be connected to wiring harness for this test.
Is voltage greater than 1 V?
Yes GO to B3.
No SERVICE high resistance in Circuit 904 (LG/R).

B3 CHECK FOR POOR GROUNDS
•Check for poor ground connections between voltage regulator and generator, generator and engine, or engine and battery.
Are all ground connections clean and tight?
Yes GO to B4.
No CLEAN or SERVICE grounds as required.
read MORE @ http://www.diesel-dave.com/vehic/manual/stj/stje0006.htm#b

Wiring Diagram in an 88 5.0 Bronco; same as Ford EVTM
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=21065

Wiring Diagram showing Point A and ckt 36 Y/W
http://www.diesel-dave.com/vehic/manual/stj/stje0003.htm
 

·
Use the Force...
Joined
·
968 Posts
Discussion Starter #7
Got it, guys. I went out to check all connections and run the troubleshooting Miesk mentioned and saw the B+ charge cable nut was loose. Tightened it and no more issues. Thanks for the help!
 

·
Charlie don't surf..
'92 Ford Bronco XLT
Joined
·
15,205 Posts
nice easy fix, and free...those are few and far between...so enjoy it...:thumbup
 

·
Super Moderator
Joined
·
26,076 Posts
yo Ted,
good chob mon! btw, I always check my nuts too
 
1 - 10 of 10 Posts
Top