My 92 D250 seems to have a random issue with the charging system. Sometimes it'll work, sometimes it won't. <br>When I start the truck, either it's charging or it won't until some future restart. <br>When it doesn't charge, I get a check engine light with codes of 34, 1, and 24. 34 is speed control and the 1 and 24 point to a low TPS reading. <br>I'm thinking it's some sort of connector issue. I was going to clean every electrical fitting I can find in those circuits today and see if that helps. <br>Any idea what may be happening?

 

I would check the obvious first and that would be all your connections. Including the harness where it plugs into the computer inside the left front fender. Then I would have the alternator checked out. The worst case would be the computer is going bad. It controls the rate of chrage the alternator puts out. Bill

 

I have the 91.5 which I think is the same as your 92. I had the same issue 6 years ago and it was the regulator module mounted on the firewall just left of middle as you look towards cab under hood. It is about 5&quot; x 4&quot; roughly. Water would drip on the module, especially when the hood was wet and then opened. Corroded connectors. Clean it up and coat with a little petroleum jelly(Vaseline). Clean up the ground connection that is attained by the module mounting bolts, use small wire brush. The manual warns that a bad ground can easily blow the module and I had that happen as well. Module is cheap, $15 or so. Good luck, please post whether it worked or not.

 

He does not have a regulator on his truck. All cahrging is controlled through the PCM. It has a regulator built into it. Although if you do think it may be your computer you can add a external regultor like mentioned above and just unhook the factory wiring block on the back of the alternator and hook up your 2 wires. I added a external regulator to mine until I found a new PCM. All the older Dodge trucks used them, finding the rectangle harness is the hardest part about hooking it up. <br><br>Bill

 

My memory gets worse all the time but the way I remember it there is a relay that turns on the alternator when engine rpm reaches about 350. The computer gets its signal from the rpm pickup on the front of the engine, no signal no alternator.

 

I cleared up the problem with the charging system on my 92 by: cleaning the ground post on the battey, cleaning under the ground wire that hooks to the body (the one that that is attached near the radiator coming from the battery cable). Plus I ran an additional ground to the cab and mounted on the post beside the ash tray.<br><br>I do know one thing that will drive your gauges, if your light switch is going bad. Before I replaced the switch, with the ignition off and the lights on I could rotate the dimmer, which is a reostat and the gauges would move high or low depending on how I rotated the ****.<br><br>I changed the light switch out and now make sure all grounds are clean periodically and the problems has not reoccured.<br><br>I also use relays and switches for: camper lights, running board lights and aux trans cooling fan. Keeps the light switch from burning up.<br><br>Jim

 

Follow the wires down behind the dampner and make sure they are not broken frayed or grounded out on the older trucks that seems to be common. Also makesure you dont have a weaping front seal that has accumulated alot of oil and dirt betmeen the balancer and sensor, if so degrease it. an other problem is the connector located at the front of the engine unplug and clean. If the sensor is bad you will need a brass feeler gauge to instal and adjust the new one.