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Thank you to everyone who helped me out with this. In between having to take care of two deaths at work last night I was reading over the last couple posts. I had to take a look at things as soon as I got home this morning. Looks like now the problem is solved. Everything is hooked up and...

Thank you to everyone who helped me out with this. In between having to take care of two deaths at work last night I was reading over the last couple posts. I had to take a look at things as soon as I got home this morning. Looks like now the problem is solved. Everything is hooked up and...

Okay, I'm gonna find a 24 volt test light and hook it up in place of the meter I was using (between pos cable and pos terminal). The meter definitely shows a draw when the alt is hooked up. I'll post what the test light shows. Thanks for the advice.

Okay, got my main switch wiring figured out. Had it wired wrong. I'm thinking I must have had power going to the field wire, exciting the alternator, causing the original arcing problem. So, now that the switch is sorted out, I hooked my voltimeter up to the positive cable (disconnected from...

Anyone have a picture of the main switch wiring. Searched and can't find one. There are two ribbed connectors (#11) and two smooth (1 and 27). Which connections do each go to? Duh, back of switch is marked a,b,c,d. I missed them because there so **** small.

Still stuck. Hooked the batts up with the alt #2 wire disconnected and figured out I have no power at the dash. Taillights work though. My bro in-law is a whiz with wiring (mopars and old vws) and said he could take a look at it for me. Showed him the diagrams and he mentioned how simple the...

The main switch is definitely off. Also, I replaced the harness with a new one that has 74a and 74b for the fuel pressure sensor that I don't have. Need to splice them yet. I'll have to check the alternator connections better. Is it okay to remove the black silicone crap that covers the smaller...

I believe the alternator is hooked up right. Matches the diagram. #2 wire goes from main positive lug on starter (where battery + attaches) and feeds under two screw clamp to lug on alternator under plastic cap. Smaller wire is attached directly next to it and is covered with black silicone...

Used the ohmmeter again between the positive cable and positive terminal of the batt. Read 25 volts. Disconnected the alternator and it reads 4 volts. Hooked up the batts with alternator disconnected and no fireworks display. So, this leads me to believe that the alternator is the issue. Do...

Before we started tearing things down the truck functioned fine. No electrical problems to speak of. Do rectifiers just go out for no reason? Just thinking there has to be more to it than just the alternator.

I hooked my ohmmeter to the pos and neg cables. Reading was like 104.2. Disconnected the alternator wire and the meter goes back to 1 like when it is not connected. Guess that means the alternator is the issue?

With the arc we had yesterday, the batteries have been disconnected. Can I hook up all but the positive cable, then connect the test light from positive to battery without an arc.

Yup, thanks for pointing that out. :? I know how to use it with in home wiring just haven't used it much with automotive and want to make sure I'm diagnosing this right. Thanks for the diagrams. Went through them yesterday and things check out so far. I must be missing things somewhere...

Don't really know what I'm doing with an ohmmeter. How should I go about checking the harness with it?

Okay, I'm going to wire the fuel pressure switch wires together. Then I'm going to go through all the wire harness again and see what caused the arc. Any suggestions besides going through and checking each wire. thanks....

I'm reading posts and looking at schematics. From what I read, only the tractors have the fuel pressure switch. Is that the case, and if so, what'd I need to do with these wires. Tie them together? Wish I had this thing started already.

Where does it connect to the fuel pressure switch? I see no place to connect it. The original harness didn't have it.

Getting the deuce back together and ran into some trouble with the wiring. I bought a new harness from od iron. Everything matches up except where the wiring comes through the firewall there are two wires (74a and 74b) that were not on the original harness. We left them unhooked. Everything...