Starting motor

[Mathias.m151a1]

Hi i have a new fornt harnes (M151a2) on my M151a1, and when i start the engin the starter motor still runs but is not engage. and when i turn the ignition of it stops running but the engin still runs and when i turn the ignition to on again the engin stops, what can be the trouble?

[rickf]

What did you do with the A2 wiring to make it hook up to the A1 generator? You didn't hook the #5 wire to the starter side of the starter switch did you?

[Mathias.m151a1]

What did you do with the A2 wiring to make it hook up to the A1 generator? You didn't hook the #5 wire to the starter side of the starter switch did you?

Its an other generator (35ah ac) and the no 5 cabel is not attached to the generator just to the foot starter

[rickf]

If the #5 wire is not hooked to the generator then how are you charging the batteries? It sounds to me like the system is feeding itself from the generator once the switch is turned off, the only way the starter would continue to run is if the #5 wire was moved to the starter side of the switch. As far as engine shutting off when you turn the ignition back on I would need a lot more info on what was done. Your description of the generator sounds to me like a non military alternator, is this vehicle still 24 volt? What else has been changed? It is impossible to diagnose something that has been modified if I do not know what the modifications are.

[Mathias.m151a1]

last time someone drove the car was 2010 and i got the car last week but half the electrical system is connected. I have the wiring diagrams and followed it and connected everything except #5 from the generator to the start button at the foot because when it was connected it crackled when I connected the battery terminal, i can take some pictures later on today and post them aswell so you can see, its hard for me to explain becaus swedish is my main langue not english. Hope you are patient with me

[rickf]

You are doing just fine, You language is better than some English speakers. Just so you know, George on here is from Holland and is VERY good at electrical systems. So if you need someone more local to you you can PM him. I will copy his info below. Pictures would be very helpful, especially pics of the generator/alternator. If it has the original wiring in it then we will get it figured out pretty easily. If it has been rewired with home made wiring this could take a while but it can be done. It sounds like maybe #5 wire was grounded at the alternator/generator and that was causing a short, hence the sparks. That may just be a wrong connection but the running on is a backfeed to the ignition and I am wondering if maybe the #568 wire is getting power from the generator? So I really need to know what you have for an alternator or generator.

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[rickf]

OK, I found a pic that apparently you were trying to put up or decided not to? It is the alternator on your vehicle. If you put the #5 wire on the post on the left with the clean nut then that is the problem, that is the alternator ground!! The positive output is on the opposite side. Here is what I want you to do. First, check that the #5 wire is on the starter switch on the same terminal as the wire COMING FROM from batteries. Tape the end of the wire at the alternator before doing this as it will be hot after the connection. Then just quickly tap the other end on the terminal on the right side that has the insulator on it. If no sparks then hook it up. Then take the ground off of the case and tap it on the other bigger terminal on the left side, again, if no sparks hook it up. Your 568 wire should hook to a loose wire coming out of the alternator. That loose wire on yours kind of worries me since it does not look original. Make sure it goes to the brushes and not to a tab on the frame inside the opening. Turn the ignition switch on and tap the 568 wire to that one, it might spark a little bit but should not have heavy sparks. If light sparks then you are good to hook it up and try it out to make sure it is charging. Be sure to check with a meter on the batteries right away because if it is unregulated it can charge at over a hundred volts. If for some reason you cannot get the vehicle to turn off just unscrew and pull out the wire from the distributor, That will shut it off. Whenever doing this kind of work I always leave the battery terminal loose, not bolted. Just push them down snug and that will be fine for testing. This way if you have an emergency and something starts smoking you can quickly yank off a battery terminal.

[Mathias.m151a1]

Yes sir! I Will try that and i’ll be back with info. Thanks again