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Fan Amperage and Wiring.

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Old Mar 19, 2001 | 11:47 PM
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Fan Amperage and Wiring.

Just picked up a Junkyard electric Cooling Fan for my Lg4 ( single type )

How many amps will this pull, ( what Fuse should I use )

Also, Is there a particularly good place for me to wire it too, Or should I just Do My own deal ?

Its an 85 Car, Does it have the Space in the fuse block for an electric Fan that I could just tap Into ?


Oh yeah, originally a clutch fan If you hadnt
figured that out by now )

thanks


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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype
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Old Mar 20, 2001 | 06:44 PM
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Bort,

The stock single fan motor is 150W. You can do the math - P = I x E. Power (watts) = Current I, in amperes) X Electromotive force (voltage). A 120W load at 12V should draw 10A. A 150W load should draw ?.

There is probably no fuse in the panel for the fans, since fan power circuits are protected by fusible links from the factory.
Use at least AWG14 wire for the power circuit, and install a 20A circuit breaker in like instead of a fusible link. You should install a control relay rated for at least 15A, and control the relay with your switch or sensor, rather than the fan motor directly.

The factory circuit looks like this:




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Vader
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"I'm'a do Things My Way - It's My way or the Highway."
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[This message has been edited by Vader (edited March 20, 2001).]
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Old Mar 20, 2001 | 10:24 PM
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From: Johnstown, Ohio
Car: 84 Z28
Engine: 355 (fastburn heads, LT4 HOT cam)
Transmission: 700R4
Axle/Gears: 9-bolt, 3.27
That Vader is just too darn thorough! LOL

I have the dual fan setup on my car (Not original) and I have the relays from the donor car, and I just used a 25 or 30 amp fuse for each. I do know that both of them on a 30 amp fuse would blow the fuse, so startup current is over 15 amps per fan, and I imagine that the one larger fan would be higher (Larger blade.)

If you need, I can draw up a diagram of how I have mine wired, since you don't have computer control, just email me!

Good luck!

------------------
Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand.

Starting to look like the Kicker poster child!

ASE Certified Master Tech
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Old Mar 20, 2001 | 11:10 PM
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Hey vader, check out my sig. Who is it?

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[This message has been edited by LottaBallsCamaro (edited March 20, 2001).]
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Old Mar 21, 2001 | 10:28 AM
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!@^@*$&#@(%(!*@
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Old Mar 21, 2001 | 11:56 AM
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Thanks Vader, pretty much what I had planned To Do if Noone Suggested Better.




------------------
60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype
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