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Paul..... ....you read but you don't understand. thats ok 'cuz at least yer asking the same questions many electrically challenged ask. The common and popular Delco 10SI 3-wire 12-volt alternator has a slip-on spade terminal P1 (l/h) that is called "switched excite". That means the internal solidstate voltage regulator needs someone to "turn-on" the internal electrics. Wannna guess where that turn-on voltage comes from? But unfortunately, due to the design of the internal solidstate guttz, once the electrics are turned on, it now OUTPUTS VOLTS. Thats ok as long as yer ignition switch is ON trying to INPUT VOLTS and they balance out. Wannna guess what happens when you TURN OFF yer ignition switch to stop yer engine? Wannna guess WHY yer engine don't STOP? All is not lost, the commonly used trailer marker light, used as an "idiot-lite" like God and General Motors intended comes to your "rescue" and slows down the back-volts coming outta the alternator P1 terminal and now you have very weak sparkies and yer engine quits. Isn't that amazing? The trailer marker light is used as an idiot-lite 'cuz it comes with 2-wires already attached for eazy installation between the ignition switch ON terminal and the alternators P1 terminal. Simple, eh? As fer yer confussion at the 3-terminal power distribution block under yer ampmeter, the bottom terminal is the battery power SOURCE and supplies the 2-wire ignition switch power IN. The other ignition switch wire is POWER ON and goes to BOTH the "infamous ballast resistor" and the alternators P1 excite terminal thru the IDIOT-LITE. The output of the "infamous ballast resistor" should go thru a 12-to-6volt converting resistor (HOT! burnie-burnie) to the ignition coil terminal. Simple, eh? Also, the common Delco 10SI alternator has a 2nd slide-on terminal called (what else) P2 (remote volts sense). Its function is to read the battery volts and control the alternators charging output. In tractor conversions, P2 (remote volts sense) is connected by a short wire to the alternators BIG STUD output. The alternators output is wired to a convient BATTERY terminal. Usually the battery cable starter studd. Simple, eh? ..... ...respectfully, Dell a 12 volt advocate for the right reasons That said, I haven't found the right reasons for my eazy starting 6-volt 8N and I know how to do it right the first time. Infact I know 8-ways to do it and they all work.
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