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On a COLD winter morning I started my truck.... except it did not stop, starter kept going!... WHERE ARE MY WRENCHES! and going..... OH !@#$&&! and going.... GET THE BATT LUG OFF NOW! ....Still going kinda, lots of smoke. Then stop. Oh man why did this have to happen in the middle of a...

Thanks warthog! I will read over this and add it to my list, would love to get that cleaned up, lots of corrosion. But for now I need my rig ready for winter snow plowing. My driveway is 3/4 mile long.

Solved it, I'm not a fan of jury rigging stuff but this was the only way I know how to solve this problem short of replacing the cluster. The copper ribbon on the upper contact of the bulb holder was in bad shape. Sometimes I would get a voltage reading sometimes not, lot of resistance. Also...

So I did some more troubleshooting, here is what I found for anybody having this issue- The Gen 2 bulb does feed the 24 volt wire to the relay, it is solid brown. I get 24v to the bottom ribbon strip on bulb holder and continuity from upper ribbon strip on bulb holder to the relay plug brown...

I guess my alternator is not very "exciting". After hooking up the white wire with white stripe to the 12v buss still no light, also no 24v to the brown wire w/ white stripe on the 2 wire plug at alternator even though I had it before... I checked continuity from the alternator plug to the...

Found it! blue fusible link on 12v terminal to red wire white stripe totally fried. I must be getting the 21-22 volt reading through the alternator winding, very confusing. anyway just need a new fusible link and I should be good to go. Thanks for all the help. I found out why the fusable...

O.K. so i don't think my cucv is wired correctly. On Alt 2 the red wire with white stripe now reads 21-22 volts, I could have sworn it was 12.5 before also it shows continuity to the red wire which is reading 24v which it should not be doing (short?) also I just noticed that the wire going to...

Thanks to you I now fully understand the Gen 2 charging circuit, I will tackle this later and post the results. Thanks again warthog.

Thanks for the reply cucvrus. Since I'm getting all the right voltage on the correct wires at the alternator then it's got to be an open ground inside the alternator itself. Maybe when they rebuilt this alternator they used the negative post as the ground for the rectifier not realizing it's...

After thinking about what you said about the bulb getting it's ground from the rectifier, that would imply that there is a path for the brown wire with white stripe to take to ground via rectifier and the alternator housing correct? That would light up the bulb at the other end until the engine...

This is my snow plow truck 1986 m1008 owned for a year. Had a leaky injector pump so I replaced it with a new one, new harmonic balancer, both alternators rebuilt, the list for things to do is getting bigger. Today while troubleshooting the Gen 2 bulb notice fuel leak coming from the top front...

So alt 2 gets it's "ground" +12v on isolated negative terminal (Red orange stripe). The positive terminal is +24 volt (Red also on this terminal there is an orange wire) 2 wire plug is Red +24v all the time, brown +24v key on. I'm not seeing a ground that would light the bulb here? When I...

Hey, I know this has been hashed out over and over but I pretty much know specifically what my problem is. My truck is a 1986 m1008. I just had my alternators rebuilt, with the key on I get 24v to the brown wire on the 2 plug on alt 2, 24v relay works, I get 24v to the bulb but no ground to...

I had the same issue, I added solder to the tips of the 10A fuse. It effectively widened the tips enough to make a better contact. Have not had any issues since I did it a year ago.

Your correct. That must mean I hooked this solinoid up wrong. I'll drop it and put that wire on the S stud and try again. Thank you for helping.

Looked at the wire diagram, thank you! Apparently The purple wire that goes on the S terminal must have come off the original solinoid. The red wire is on the R stud that according to the diagram is correct. I will drop the starter and try to find that purple wire. Again thanks for the help.

I have the correct 24 volt solinoid on the starter. Also the key activated relay under the dash is working. I jumpered the purple and red wire just to be sure effectively by passing the relay and still no crank. I have not tested for 24v at the starter solinoid yet.

Oops- "Red small wire to R post on relay" meant meant to say solinoid.

1986 M1008 Starter Solinoid question Thanks for getting back to me. My M1008 has a starting problem It's a new to me truck worked great after some electrical problems were taken care of. I had a run away starter and traced the problem to the starter solinoid. Replaced new starter solinoid and...

O.k., new here, thanks for all the great info so far. Had a run away starter. The solinoid was shorted. Replaced it, did the relay mod. hooked everything back up tried to start then nothing but the doghead solinoid mod under dash click. Confirmed getting 24 volts between red and purple...