Joined: Oct 06, 2014 Posts: 252 Location: South Dakota - Aberdeen
Posted: Mon May 30, 2016 4:41 pm Post subject: charging system
I am having a problem with the jeep not charging. When I start the jeep and unhook the battery cable, it kills the jeep instantly. when it is running an I check voltage, it does not go up no matter the RPM. I am finishing up the resto, and had all the parts (stock 24v, generator, regulator, etc.) but this is the first time hooking them all up and using them. I have gone through the generator and tested it by hooking a lead wire from the volt meter to the c pin and b pin for a short period to the battery positive. got to 32 volts so I know that is working. Before that I had polarized the generator by touching the starter post to the b pin.
Pretty sure I have a problem with the regulator. I had gone through that and cleaned it and made sure points were set right, but that is it.
By the way all wiring is brand new, except the cable that goes from the generator to the regulator.
I carefully took the top of the regulator off and started the jeep, I saw nothing happening. Turned the jeep off. pushed the double points down on the circuit breaker portion of the regulator and the generator started squealing like a pig. Had to unhook the battery to get it to stop. Probably not the smartest thing to do, but I did it. Anyone know why it would do that?
I have the 1825b portion downloaded, but not sure how to proceed from here or if I'm capable. Unless someone has some suggestions, I may have to find someone that can bench test this or check it out.
When you closed the reverse current relay by forcibly closing the contacts you delivered 24 volts to the generator and tried to motor it over. The belts resisted the rotation of the pulley which is to be expected. Yes, not the brightest thing to do. We often check the armature and fields of the generator by supplying 24 volts to it and it should turn over just like an electric motor but we always disconnect or at least loosen the belts.
So based on your polarizing and full field test and your unintentional motoring over of the generator we know the generator is good to go.
Next step remove the generator to regulator cable completely. Next ohm it out. First ohm out each pair of pins (at both ends) A to A, B to B, and C to C. Do you have zero resistance (continuity) on each?
Next at one end or the other, check A to B then A to C, then B to A and B to C, then C to A and C to B. Did you get any continuity between any of the pairs of checked?
Next check for continuity between each pin on one end and the cable's braided sheath. A to sheath, B to sheath & C to sheath. Any continuity shown?
Let me know how the cable assembly checked out before we proceed.
You said you were reading a volt meter. Have you replaced the amp meter with a voltmeter? If you did what have you done with wire # 8 and # 9? What wire did you connect the voltmeter to? _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Joined: Oct 06, 2014 Posts: 252 Location: South Dakota - Aberdeen
Posted: Mon May 30, 2016 7:06 pm Post subject:
Thanks for the reply Wes. I will check the ohm readings tomorrow and let you know.
I taped off the two amp wires and got a 5 wire spider and plugged one of those wires into the volt gauge. _________________ Aaron
1950 M38 - #MC11328, 24volt, 1948 CJ2A (Lefty)
If you don't have one yet you should definately consider a battery cutoff switch. Makes regulator work a lot safer, especially for your new harness. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Joined: Oct 06, 2014 Posts: 252 Location: South Dakota - Aberdeen
Posted: Mon May 30, 2016 8:26 pm Post subject:
wesk wrote:
Next step remove the generator to regulator cable completely. Next ohm it out. First ohm out each pair of pins (at both ends) A to A, B to B, and C to C. Do you have zero resistance (continuity) on each?
Yes, each one has continuity.
Next at one end or the other, check A to B then A to C, then B to A and B to C, then C to A and C to B. Did you get any continuity between any of the pairs of checked?
No continuity.
Next check for continuity between each pin on one end and the cable's braided sheath. A to sheath, B to sheath & C to sheath. Any continuity shown?
No continuity.
The cable is good. One last check. The exterior of the cable should be checked for continuity from threaded connector to the opposite end's threaded connector.
This direct ground between the generator and regulator is very important as is the ground from the generator to the front engine plate and the front engine plate to the frame. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Joined: Oct 06, 2014 Posts: 252 Location: South Dakota - Aberdeen
Posted: Mon May 30, 2016 9:11 pm Post subject:
There is no continuity when touching the metal threaded ends but there is when touching the brass rings around the braided sheath. Does this make sense? _________________ Aaron
1950 M38 - #MC11328, 24volt, 1948 CJ2A (Lefty)
Are you clamping the rotating threaded section solidly to the main sleeve? _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
OK cable is good. And you checked for a good ground at the strap between the front engine plate and the right engine mount tower?
This brings you to cleaning contacts on the regulator and checking condition of contact springs.
Then after you ensure you have a quick disconnect on the batteries follow the procedure for adjusting the regulator step by step in the manual. If you do not feel totally technically comfortable doing this I advise removing both the generator and the regulator and taking them to an auto-electric shop along with a copy of the manual. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Joined: Oct 06, 2014 Posts: 252 Location: South Dakota - Aberdeen
Posted: Tue May 31, 2016 5:14 pm Post subject:
wesk wrote:
OK cable is good. And you checked for a good ground at the strap between the front engine plate and the right engine mount.
I have a ground strap from the front of the generator to the frame. Do I need another? _________________ Aaron
1950 M38 - #MC11328, 24volt, 1948 CJ2A (Lefty)
Joined: Oct 06, 2014 Posts: 252 Location: South Dakota - Aberdeen
Posted: Mon Jun 06, 2016 7:49 am Post subject:
I broke down and ordered a solid state regulator. Very easy to install and once I got my belts tightened correctly, the thing works great. Charging system is now functioning great. _________________ Aaron
1950 M38 - #MC11328, 24volt, 1948 CJ2A (Lefty)
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