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12 volt convertion question

P

Paul G. in Mn

Member
I have a copy of Bob's wire diagrams and have a question. On one page it shows useing useing a delco altenator useing 1 wire and nothing hooked to the top conector and on anther page it shows hooking one of the top wires to the side terminal and the other to a powered switch. What is the difference between hooking it up these 2 different ways? I have a 39 M and would like to use the 1 wire method since I dont have a switch for the mag to hook it to.
 
Good question.
THe one wire Delco is equipped with a regulator that is self exciting. It has two problems, one is that it needs to be operated at 3/4 throttle or more to begin making volts. (it continues after that even at idle) The second is that they tend to run down the battery between uses. They kinda leak current when not being used.
The easiest way to use the multi wire system with a mag is simple. Use a NAPA oil pressure switch that turns on with pressure of 5psi, and is open when no pressure is on it. T this switch into the oil pressure port and run a Hot wire from the starter sw. to the pressure sw, then from the pressure sw to the #1 terminal on the alternator (The standard SI-10 unit) This needs no diode, no idiot light or any thing else. The #2 terminal hooks as shown to the Big terminal on the alternator (just a short wire). JimN
 
Jim. Do you have a part number for the NAPA oil pressure switch? I'd like to modify the three-wire setup on my H to include one of those.
 
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