1. In your first pic you say "How it should be and how it was". Can you see the text in purple? It says Model 12si Delco. You said you have 10si. Which is kind of true. Maybe you already knew the old one was a 12si? If it matched your first pic.
2. In your second pic you say "our alternator". That seems to be a 10si. HOWEVER, the big battery terminal is in a different place than normal. You can see that the normal place just looks like a nut in your pic, but next to it says "BAT". I assume it is like that because it was converted to Positive ground but I do not know.
3. You can test the alternator, with all wires disconnected, to see which it is, positive or negative ground.
Use Multimeter set to ohms/resistance.
Positive probe on big bat stud, negative probe on case. Record reading.
Then reverse the probes. record reading.
A negative ground alternator will show high resistance when the positive probe is on the bat stud and show low when probes are reversed.
A positive ground alternator will show low resistance when the positive probe is on the bat stud and show high resistance when probes are reversed.
You said: The chassis is negative grounded to the battery through the "cut off switch". Is this right or not?
Please explain where the battery negative cable goes.
To the cut off switch? Thru the switch to the frame?
DO NOT use the word "chassis" when speaking about electrical. It is too vague. There is a frame, body sheet metal and the Motor. Normally the negative battery cable goes to the motor. Then there are straps from motor to the frame and from frame to body. It can vary as long as all three are connected. I do not recommend a cut off switch. Especially for a person with problems and a person looking to use a distribution point and eliminate so many connections/resistance points.
I recommend you order this alternator from AMAZON.NL.
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