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That would explain why the sparks where flying. A dirrect short from the battery to ground. Glad you found it. If the alternator is fried, I would make the shop replace it as it was their fault. Sounds like it time to find a new shop as this one clearly didn't understand the "Isolated Ground".

If the black wire you are asking about goes into the little silver cylinder, then yes, no black wire. My M1009 doesnt have the black wire hooked up. Is this black wire connected to anything else? Anyway to post a picture of how your alternator is wired up and where the black wire is?

The supperssor is a capacitor. It helps reduce/eliminate the electrical noise that interfers with radios. Remember the old AM radios and the whine that would get louder when you accelerated? (you may not be old enough...but I am...LOL) There are supperssors on the horn, wipers, heater...etc...

Was the eletrical system working correctly before the alternator quit working? My bet is the rebuild was not don't correctly. Another possiblity is the suppersor is bad and causing a short. It is not needed unless you are running military radios.

You are correct. I didn't look closely at the diagram. ;) The small cylinder should be the noise suppressor that is in the wiring diagram. Some trucks have it removed. The alternator picture is from the NAPA website. I use it as a reference. The red wire in the plug should be on the...

You will have 5 wires to hook up. 1. The two with the plastic connector that plugs into the alternator. 2. The small orange wire/fusable link for the diagnostic port that hooks to the +postive post 3. the large red wire that comes from the 24v terminal block, hooks to the +postive post 4. The...