Thiss

September 24

18:00 Hours

Problem: Over charged battery last night. Smoked battery.

Solution: New battery, Altenator, and Voltage Regulator

September 25

06:00 hours

Problem: Won't crank (grid heaters worked) dead battery, won't even jump

Solution: New battery

12:00 hours

Problem: Dead battery, won't crank

Solution: disconnet all unnecissary connection, clean terminals, and tighten connection. engine starts with a jump

Current state waiting to see if battery will hold charge. Please let me know what I am missing. Help

MrExtreme

Unless your truck has had the externam regulator mod done, the voltage regulator is in the PCM (computer).

93flatbed

See what the draw on the battery is. Next loaded voltage drop on the battery cables. Spec is 200mili Amps, on each cable, if my old brain is working right.
Had kinda the same problem, found bad neg cable. I cut it apart and found no acid damage don't know what the deal was but it fixed it. Good Luck

Onemoparnut

91.5 is externally regulated 92 and 93 are pcm regulated.

Thiss

Well today I had to jump the truck again this morning. Truck didn't want to jump, even after having it on a battery charger that read full. This directed me to the starter, which I replaced (even though the bench test said "good" on the 19 year old factory 227,000 starter). With a new starter, alternator, voltage regulator, and fully charged battery; the truck fired great. While running I am getting 14 volts and a slight vibration on the volt meter (will check with an amp-meter tomorrow) with the blinker on (right or left) the voltmeter ticks. Also while hooking up the battery I unhooked the two positive leads to the wiring harness, and with the round plug connected i get a spark, so i have a short in the wiring harness; right?

wannadiesel

If the truck has an underhood lamp that will cause a spark.

Thiss

I have the lamp unhooked. I have enough unplugged at the moment to not be causing a draw. I am currently most worried about the volt meter ticking in rhythm with the flashers and the turn signals. This must be a bad ground, how are you all grounding your body. I currently have no ground cables attached to the frame.

GIT-R-DONE

On one of my previous trucks, I bought a long ground cable and grounded from the battery to the cab. I also grounded from the cab to the frame (one day I had the bed off).

whosdunit

I'v noticed my 91 does not have any grd., conn., from, mtr., to frame or to cab, i guess they ran out of grd., that week (lol).