I'm tring to hook up a MIII fan, no directions in kit, what is meant by running 2 relays in (paralell), and should i take the power right off of the battery?

iii

People run two relays in parallel because the amp draw from the fan is greater than what most common relays can take.

I think the mk8 fans can draw over 40amps and most (radio shack, auto supply) relays are only rated for 20 to 30 amps. If you manage to find a big relay, you can get by with one, but make sure you are comfortably above the max draw from the fan.

I think most people run straight from the battery and use at least 10ga or bigger wire. Also, I've heard a lot of people run the relay on the ground side of the fan instead of between the battery and fan. I never understood the reason for this, but i'm sure there is one.


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Charles Perrell
cperrell@yahoo.com
65 malibu SS Convertible
283 2v powerglide

Shoot me an e-mail if you still need info on the parallel relays. I'll draw a simple diagram for you.

I'm a little delirious right now, so I'm not ready to draw. Just got home from offshore.

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My Web Page (http://www.landry-family.com) (updated 1-9-02)

"America will endure!"

Chad Landry
TC Member #643
ACES Member #04556
'68 El Camino

C.P. was right on. http://www.chevelles.com/forum/cool.gif

The less wire you can use the better.

Bosch makes a 45Amp relay that is what I use. It even has screw terminal lugs for bigger gauge wire. I use 10 gauge and have a 40Amp fuse in line, which as never blown. The does pull (current wise) near 35Amps.

The fan has 3 terminals. Use the outter two. There is a label on the white plastic piece that denotes + and - .

If you can't find info from lack of the serach function, CJlandry has done a good job of keeping track of his install and has pictures of others installs (like mine).

good luck and stand back when you turn it on. http://www.chevelles.com/forum/eek.gif

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71' 3880# with me. Big Block 402, Merlin oval heads, 10.2:1CR, TH400, 3.73 posi,
1/8th: 8.0 @ 88mph
BEST 60': 1.85 w/street tires.
BEST 1/4: 12.5 with 1.89 sixty foot (street tires)
BEST MPH: 109mph

Picture of me roasting the tires and other guy stuff (http://www.auburnextremeracing.com/drivers/mike/)
Video of me staging (smoke of course) (http://www.auburn.edu/~ledfojw/vids/mike_chevelle_burnout.avi)

Mike,
Do you have a part # or original application for that Bosch relay?
All the auto stores around here hand you a book with about 30 pages of relays listed, no amps, just applications.
I think Wes said he had a Bosch 75amp but he can't remember the application or PN either.
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Matt Arbenz
72SS Convertible ZZ502
http://members8.clubphoto.com/matt525690/owner-8c80-1.phtml

[This message has been edited by GLOCKBENZ (edited 01-31-2002).]

[This message has been edited by GLOCKBENZ (edited 01-31-2002).]