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The Haynes manuals have excellent wiring diagrams. A Dodge dealership may be able to order you one also.
ORieley auyo parts,They sell manuels. Get the one on Electical system.
autozone.com has wiring diagrams most public libraries have chiltons and or haynes manuals you can copy the pages you need for like 10 cents each
Half Ton
Dextron 2
Go to your local dodge dealer and ask if you can get a copy.
Check the electrical lead, under the dash, which goes to the ammeter. If this lead is loose or disconnected, it kills all power to the truck.
NONE.
SAE 10W-30 any major brand.
The point gap in a 1972 d100 varies. For the 225 slant 6 cylinder the point gap is.017- .023. For the 318cid, 360cid, 400cid and 413cid engines the gap is .014- .019.
one on the cross shaft from the frame to the engine