SkinnyG
SuperDork
8/25/17 12:01 a.m.
Am I doing something wrong?
Only tested once, but it didn't kill the car.
Switch is a two pole switch.
Battery Positive -> [Switch-Big-Posts] -> Big-lug-feeding-everything
Alternator-Field -> Idiot Light -> [Switch-Wee-Posts] -> Keyed-Power
Switch ~should~ kill the wire to the alternator field (pin #1 on GM 10SI alt). Flicking the switch make the engine idle slower, but not die.
Could I just use the wee posts of the switch to kill to the fuel pump, or is it safer for the electrical to kill the alt. field current?
daeman
Dork
8/25/17 12:13 a.m.
Try killing the alternator output wire, the battery input wire is there to provide an excitor current, once the alternator is producing charge it no longer required the input current to do so.
Put the alternator charge wire (the big one) on the battery side of the switch. If I'm thinking correctly that's all you would need, single pole switch, no need to cut the field wire or anything unless it will miraculously run on the little current the idiot light can flow.
SkinnyG
SuperDork
8/25/17 10:45 a.m.
Will that output wire need to be the 2/0 the rules seem to indicate? I have 2/0 running to under the dash to feed everything else, including the starter. Can I run something smaller and cheaper?
The alternator wire only needs to be able to handle and be fused for the amperage the alternator can put out.
SkinnyG
SuperDork
8/25/17 12:16 p.m.
Ah. Good. Another trip into town then....
