Not charging

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Not charging

Postby cummins king » Thu Mar 20, 2008 6:14 pm

today i took the truck out and its not charging, i drained the battery but i need it to charge because my eletric pump, i check the battry ground its fine, and it was charging before i started working on it, its very strange

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Postby dpuckett » Thu Mar 20, 2008 6:44 pm

Could be the voltage regulator. It is controlled by the PCM in your 93, but you can bypass it, too, and put in a regular VR.

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Postby cummins king » Thu Mar 20, 2008 6:50 pm

great but how do i do that, and were do i get a VR
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Postby cummins king » Fri Mar 21, 2008 4:02 pm

so i guess this is how i fix it

The voltage regulator on the 92-92 trucks is an internal unit inside the control module. If this goes out, you can mount an external voltage regulator like the earlier first gens used.

A bad crankshaft position sensor will also cause your voltage regulator to not charge the altenator. You can also get by this by doing the following:


The two terminals on the alternator for the regulator are interchangable. The alternator is a dumb alternator for an external regulator. The PCM is that regulator normally. The alternator does not care weather it is controlled by the PCM or a regulator. The PCM is not affected by not being hooked to the alternator.

The two terminal regulator has the contacts in the shape of a pyrimid. One terminal is missing. The missing terminal and one other terminal are at the base of the pyrimid.

Ok, hook the two alternator terminals to the two regulator terminals. Does no matter which goes to which. Now run a 12 volt line from an ignition source to the top regulator terminal along with the alternator wire. Thats it except you need a good ground from the alternator to the regulator case. On a second gen get that power from the output of the ASD relay.

A little note on this system. I have doen several of them and helped a few do this change. If you hook the 12 volt up to the wrong regulator terminal, it does fry the regulator. Not much problem, seven bucks gets another one.

Mine has been running this was for a year and over 100,000 miles

The terminals for the regulator can be just the round female terminals that are used for connecters on lights and other places or go to an older junk yard and cut the plug from about any old chrysler product.

Thanks to Haulin In Dixie for the instructions.
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Postby cummins king » Sat Mar 22, 2008 5:00 pm

so i go and try to start my truck after its been on a charger for the last 24hours, and it wont even turn over like it clicks and thats it,
so i looked around and i find the crank sensor unpluged so i pluged it in im hopping that will solve my charging issues, but it still wont start
wont even turn over
so i hook up a temp ground still wont turn over,
the voltage gauge reads 13

any ideas

thanks
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Postby PToombs » Sat Mar 22, 2008 5:29 pm

Bad starter? Or dirty battery terminal? Put a volt meter on each wire on the starter and see what you have for voltage when trying to start. If voltage drops, follow back to the problem. If it doesn't, bad starter or ground.
pete

Just enough power to break everything behind the crankshaft.
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Postby GO OVRIT » Sat Mar 22, 2008 6:15 pm

Check the splice that has all the fusible links and make sure none of those are broken. Check the plastic connector for the 8ga? wire coming off the battery. This won't really help with your "clicking" when trying to start, but could be charging problems. Do what Pete said to check the starter, or just jump the big terminal on the starter with a jumper cable for a quick test of the starter. Jump the small terminal with a hot wire to check the starter soleniod.
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Postby cummins king » Sat Mar 22, 2008 9:32 pm

thanks guys
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Postby 82F100SWB » Fri Apr 04, 2008 9:05 pm

While we're on this subject, my 92 stopped charging on the way home with it tonite. The PO had had it stop charging a while back, but, while it was sitting(he moved on to a second gen in the fall) it seemed to have cured itself. It worked fine last week when I test drove it, and Brian had run it a bit this week, with no problems. About a half hour out of his place, lights on, heater on, it stops charging. I'm thinking it's probably not the alternator, but, I am without a shop manual, so, how do I test the PCM and CPS to determine what is at fault?
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Postby cummins king » Fri Apr 04, 2008 9:42 pm

at the front of the motor by #1 valve cover there is a plug, check that first, it must be pluged in for the truck to charge, then if thats fine then it could be the VR
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Postby PToombs » Sat Apr 05, 2008 5:13 pm

PCM is the VR on his truck. The wire CK is talking about is the crank sensor wire. Check the clearance to the balancer, should be .050. The plug is known to corrode, and the wires get chewed up or crappy over time.
pete

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Postby 82F100SWB » Sat Apr 05, 2008 11:26 pm

I found the culprit, the main charge wire off the alt was corroded at the crimp for the ring end at the alternator. Fixed that, and all is well.
92 W250 SLE reg cab, 5 speed, guages, screws fiddled with...
89 W250 reg cab, 5 speed, all stock but who knows... LOL

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Postby cummins king » Sun Apr 06, 2008 6:06 am

good
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