Temp Control kit & relay installation question - Team Camaro Tech
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post #1 of 8 (permalink) Old Apr 3rd, 10, 02:32 PM Thread Starter
 
Join Date: May 2006
Location: Northern VA.
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Temp Control kit & relay installation question

Subject should read "Temp Control..."

Hey guys. I'm rewiring my 67 Camaro mainly because the wiring was old and the fan didn't come on, which almost cause the car to overheat. I have th Flex-a-lite temp control kit (#31147) to control dual fans. I'm adding relays to this circuit but can't figure how to connect it all together. Flex-a-lite doesn't have any guidance when it comes to adding relays. Looking for help!!! Oh, the rest of the wiring is complete and all is working correctly!!

Double R

Last edited by rarobins; Apr 3rd, 10 at 03:56 PM.
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post #2 of 8 (permalink) Old Apr 3rd, 10, 04:10 PM
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Steiner
 
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Re: Tamp Control kit & relay installation question

You only need one 40A relay (or properly sized for you fan set up....go 10A more than rated current).

On the relay contacts, connect fused +12V directly from the battery to one side and the other side should go to the +12V main power lead on your fan. The electrical section of most auto parts stores has auto reset circuit breakers that can be mounted on the core support by the battery that are good to use in place of a large fuse.

Connect the - lead of your fan setup directly to the - post of your battery.

Run a 5A fused line from the ACC or RUN spade on your fuse block inside the car to one side of your temp control unit, then run the other side of the fan control switch to the + side of your relay coil. Connect the other side of the relay coil to ground.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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post #3 of 8 (permalink) Old Apr 4th, 10, 11:18 AM
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Rod
 
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Re: Tamp Control kit & relay installation question

http://www.dewitts.com/download/FRH.pdf

Rod
69 Camaro with LS2/4l70e

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post #4 of 8 (permalink) Old Apr 4th, 10, 05:41 PM
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Greg
 
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Re: Tamp Control kit & relay installation question

I would recomend you connect the positive power side to the horn relay buss bar rather than the battery. Both would work of course but voltage will be higher at the buss bar (thus the fan will pull harder) and you won't have as much voltage drop at the battery because alternator output will compensate for the fans at the buss bar.

This is assuming you have a 3 wire alternator of course.

69 Camaro, 3650lbs., 400ci, TH400, Coan 10" converter, 3.50 gear
D1SC, pump gas, 9:1, 10 PSI, Water/Meth injection
1.325 60', 5.988 @ 115.4 (carb)
Switched to Super Sniper EFI 2019
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post #5 of 8 (permalink) Old Apr 9th, 10, 12:18 PM Thread Starter
 
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Re: Tamp Control kit & relay installation question

Quote:
Originally Posted by Steiner View Post
You only need one 40A relay (or properly sized for you fan set up....go 10A more than rated current).

On the relay contacts, connect fused +12V directly from the battery to one side and the other side should go to the +12V main power lead on your fan. The electrical section of most auto parts stores has auto reset circuit breakers that can be mounted on the core support by the battery that are good to use in place of a large fuse.

Connect the - lead of your fan setup directly to the - post of your battery.

Run a 5A fused line from the ACC or RUN spade on your fuse block inside the car to one side of your temp control unit, then run the other side of the fan control switch to the + side of your relay coil. Connect the other side of the relay coil to ground.
OK, I will give this a try this weekend. Thanks,

Rod
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post #6 of 8 (permalink) Old Apr 17th, 10, 06:24 PM Thread Starter
 
Join Date: May 2006
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Re: Temp Control kit & relay installation question

OK guys, I finally got a chance to test this connection out. Using a 40A relay I connected battery to 40A circuit breaker and out to pin 30 of the relay. Pin 87 went to positive fan lead. Negative fan lead went to ground. Fused (20A) Acc lead connected to one side of the Temp control switch and other side to pin 85. And finally pin 86 to ground.

I heated the thermometer connected to the temp control switch and it cut the fans on for about 2 seconds. Then the 20A fuse blew. I can't figure out why it blew the fuse. This is the only bug that is keeping me from putting the car on the road.

I have two relays and two circuit breakers setup as described above. Could this be a problem? Should I only use one relay and one breaker?

I need help!

Thanks
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post #7 of 8 (permalink) Old Apr 18th, 10, 03:32 AM
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Steiner
 
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Re: Temp Control kit & relay installation question

Check your temperature switch pins and see if one is grounded. If so, you may have to rewire the coil leads so that you have ACC going straight to pin 85 (instead of through the the temp switch) and then connect pin 85 to the ungrounded pin of the temp switch. Then when the temp switch activates, it provides ground for the relay to activate.

If everything is correct, there really is no need for two relays. One 40A relay should be plenty for the fan supply if your wire size is correct. I guess using one for each fan would provide a failsafe though.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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post #8 of 8 (permalink) Old Apr 21st, 10, 06:05 PM Thread Starter
 
Join Date: May 2006
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Re: Temp Control kit & relay installation question

I figured it out guys. In the American Autowire harness, there are two orange wires for the fan. One was 20A and the other is 30A. I had them reversed with the 20A wire going to pin 85 on the relays and the 30A wire going to pin 30. Once I reversed them all worked properly. Thanks for all of your help!
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