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Old 04-26-2009, 09:52 PM   #1
MN-Brent
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Default C5 cooling fan power wiring schematic

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.
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Old 04-26-2009, 09:56 PM   #2
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This what you want?
Click the image to open in full size.
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Old 04-26-2009, 09:59 PM   #3
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byronhunter, you are getting fast with those diagrams....4 minute response time....
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Old 04-26-2009, 10:02 PM   #4
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Originally Posted by lucky131969 View Post
byronhunter, you are getting fast with those diagrams....4 minute response time....
Yea! Most of the time you beat me to it!!!!!!
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Old 04-26-2009, 10:07 PM   #5
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What are you trying to do? Later! Frank
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Old 04-26-2009, 11:07 PM   #6
MN-Brent
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Originally Posted by byronhunter View Post
This what you want?
Click the image to open in full size.
Close, but nope.

The power distribution for "Hot at all times" diagram for the fan power circuit.

Do you have that diagram?
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Old 04-26-2009, 11:21 PM   #7
Bill Dearborn
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Is this what you are looking for? B+ not V+ distribution.

Bill
Click the image to open in full size.


Click the image to open in full size.

Last edited by Bill Dearborn; 04-26-2009 at 11:27 PM.
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Old 04-26-2009, 11:27 PM   #8
MN-Brent
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Originally Posted by fnsblum View Post
What are you trying to do? Later! Frank
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.
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Old 04-26-2009, 11:33 PM   #9
MN-Brent
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Originally Posted by Bill Dearborn View Post
Is this what you are looking for? B+ not V+ distribution.

Bill
Click the image to open in full size.


Click the image to open in full size.
Bill
YES!!!! This is exactly what I needed. A HUGE Thank you for this.

BTW, My next Vette will most likely be a late model 03 or 04 Z06 with the steel shift forks in the tranny. Hope the comeradery on the C5 side is as good as it is on the C3 side.

Thanks again!
Best Regards, Brent.
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Old 04-26-2009, 11:33 PM
 
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