12si alt

F

fireride

Member
Looking for some advice on upgrading the stock wiring on a 72 Scout II 345. I want to upgrade the alt. To a 12si 94 amp unit. Im not sure of the best way to upgrade the wiring to handle the extra output. I have the remote solenoid on the fire wall. Can I run say a 4 gauge wire from the alt. To the battery side post then run the stock 10 gauge from that point through the amp meter to the battery? Im definitely weak in auto electrical and don't want to burn anything up if I can prevent it. Ive done some research and have read the best is to replace the amp meter with a voltage gauge and put an indicator light in but I would rather keep the dash gauges stock and functional. If someone can give me guidance I would appreciate it.
Thanks
 
I would like to do the same as the po installed a 12si in my Scout. But he just kept the original wiring and shorted the voltage sensing wire directly to the output so it effectively acts as a one-wire alt.

My plan is to run a properly fat wire directly to the battery. Run a new continuous wire directly to the "output" post on the amp meter, bypassing the amp gauge and the bulkhead connector. The sensing wire for the 12si could go to the input post in the fuse box or similar point of distribution for the consumption side of the circuits. Would have to check the resulting battery charging voltage though, so it doesn't get boiled :)

I guess with a bit of fiddling, the old amp gauge could be converted into a functional voltage indicator. Either with some clever use of the right resistors etc. Or by transplanting the guts of a modern volt gauge. For me I don't really need the volt readings on the gauge dial, it would be enough if a straight up position represents 14.2v.
 
I thought about something similar, but wont running a wire direct to the battery bypass its ability to regulate and adjust amperage output?
 
also, re: 10 Si vs. 12 Si:

I am also wanting to improve the stock 10 Si 63-amp setup on my 77 and 79 Scouts. I am told the 12 Si has a better cooling fan up front and that is it more "robust" re: amperage. I want to keep the Scouts fairly stock but want to increase the amp output to about 80-90 amps. If I do this, will the stock wiring setup handle the added amps?
 
Richard said:
also, re: 10 Si vs. 12 Si:

I am also wanting to improve the stock 10 Si 63-amp setup on my 77 and 79 Scouts. I am told the 12 Si has a better cooling fan up front and that is it more "robust" re: amperage. I want to keep the Scouts fairly stock but want to increase the amp output to about 80-90 amps. If I do this, will the stock wiring setup handle the added amps?
Click to expand...

No
 
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