Until LJD gets here who you requested to answer the question, I will post my opinions, he can post his when he arrives, which may agree or disagree with mine??????
YOU STATE: The ign. post on the switch goes to the battery post on the alt. HMMMMMMMMMMMMMMMM you need to check that switch wiring I think!!!!
1) Often an ign switch will have a BAT INPUT terminal that receives hot battery voltage ALL THE TIME from say the Load side of an ammeter, or an L terminal on a Voltage Regulator, or from the battery or another always hot supply voltage source. NOTE if the alternators output is connected to the battery (needs to get to baTtery somehow to charge it) or the ammeters load terminal (should be if it has one).....that electrical location can serve as hot battery voltage supply BUT IT SHOULD BE TO THE SWITCHES BAT INPUT NOTTTTTTTTTTTTTTT IGN OUTPUT
2) Often an ign switch will have an IGNITION OUTPUT terminal thats hot ONLY when the switch is ON. It feeds voltage to the coil.
3) Often and ign switch has an ACC terminal thats hot in the first position (not yet to ON) to feed loads
3B) Often an ign switch has a spring loaded START terminal thats hot when its held there to send voltage to a starter solenoid. THATS NOT WHAT SHOULD POWER THE COIL !!!!!!!!
4) The GM 10 SI 3 wire alternators (if thats what you have) little No 1 post is for excitation voltage. When you turn on the ignition a switch terminal that gets hot then (like to coil, or IGN) can be used to send excitation voltage to that alternator terminal. I would add a 10 ohm resistor in that line however
4) The other little no 2 terminal is voltage sense. It can be jumped to the alternators big main output post or to the battery or to the supply side of the ammeter.
SOOOOOOOOOOOO CHECK THE SWITCH WIRING it needs an always hot voltage source (battery or ammeter or alternators post) on a BAT INPUT TERMINAL and the coil can be fed off an IGN OUTPUT TERMINAL. (Thats hot anytime swith is ON)... When switchd ON the switch feeds voltage to the coil so it can fire. If it has a starter solenoid the START terminal wires there
Sorry no more time maybe LJD can help you Im late for chruch
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