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I'm looking to see if anyone would have scanned or have an electronic copy of the V+ side power routing for the radiator cooling fans.
Im looking to see specifically where the power connection is physically made, and what fusible links or fuses are in the pathway.
I did a MARK VIII electric fan conversion on my C3 last year and used the heavy starter lug as the fan circuit power source. This is a direct battery connection and no fusible links with the very heavy gauge wire. However there is a fusible link from the alternator BAT+ to the starter lug BATTERY + terminal. Not sure if this fusible link is at risk with this set-up.
So the circuit is like this:
FROM BATTERY VIEW:
(BAT+ on Heavy starter lug)-->(New fanwiring with 65A circuit breaker)-->(75A relay)-->(Fan)
FROM ALTERNATOR VIEW:
(ALT BAT+)-->(Fusible link)-->(BAT+ on heavy starter lug)-->(New fanwiring with 65A circuit breaker)-->(75A relay)-->(Fan)
I'm looking to see how GM did it in great detail, whether it was a direct alternator connection and fused from there, or a direct battery V+ connection and be fused from there.
Im trying to determine where GM pulls its power from for the electric fan circuits.
1) Battery side of fusing
2) Alternator side of fusing
The big difference is the location of the main fuses, which are not included in the diagram attached above.
In the C3, there is a large fusible link between the Alternator BAT+ terminal and the starter heavy lug, which is a direct Battery connection with a heavy gauge wire.
I installed a fan which has a large additional draw and made my connection from the starter lug. Just tryin to see if I should be upgrading my Alternators charge wire from Alt to starter lug or pulling my dedicated fan circuit directly from the Alt connection.
There is logic to both set-ups and Im trying to see which way GM went.