First, welcome to OCC............ 
Here is a pictorial of the 2166 Battery Circuit. Yes, big cable going to starter Solenoid. Second wire to the B terminal on Ignition Switch. Third wire....NO CLUE. Probably added by PO for some added or optional feature.
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[B]Roland Bedell[/B]
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
[SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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