Power and ground connections for AC and cooling fan - Team Camaro Tech
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post #1 of 5 (permalink) Old Sep 12th, 09, 06:34 AM Thread Starter
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Barry
 
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Power and ground connections for AC and cooling fan

I'm installing the wiring on my 69 Camaro using a AAW custom update kit, and am also installing a Vintage Air Gen IV AC system, and will be using a Flex-a-lite 180 Black Magic Xtreme cooling fan. The AC and fan instruction sheets want you to wire the primary power and ground wires directly to the battery posts. I'm trying to keep a clean look under the hood and minimize wire clutter, and I really don't want the battery posts having a bunch of wires coming out of them (battery is in stock location, may add a subwoofer later, so more wires). The battery cables each have a fusible link coming off of them, and I'd like to route those to some sort of hidden buss bar or studded terminal connection (like the MAD Electric CN-1), and connect the accessories there. The fusible links are marked "2.0 SQ mm", or something like that. Do you think this will work ok? The fan has the capability of coming on when the AC compressor is engaged, so that means both of these things starting up roughly at the same time, so that's quite a few amps I'm guessing. What have others done? Thanks!
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post #2 of 5 (permalink) Old Sep 13th, 09, 07:26 PM
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Joe
 
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Smile Re: power and ground connections for AC and cooling fan

I wouldn't wire anything direct to the battery. You have the right idea with using a junction post (like M.A.D. sells). I would suggest running relays for the fans as well.

I have the Classic Auto Air system in my 69 (similar system). I am using a Lincoln Mark VIII electric fan set up. The fan comes on by either the temperature switch or AC clutch engagement. I used Bosch 80 amp relays (the Lincoln fans needs a lot of start up current). I have a relay for each. The power is supplied from a juction block on the radiator support behind the battery. I installed 60 amp fuses in line to the relays. Fusible links will work as well; the fuses are just a lot easier to replace on the side of the road if that becomes necessary. I have not had any fuse issues, though.

I replaced the stock junction post with one that could carry several wires. The relays are mounted at the bottom of the radiator support next to the radiator. This allows small wires to be run to the temperature switch and the fan clutch. Clean look and works well.

I also had to install a bigger alternator to run my fan.

joe

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69 Coupe; ZZ430; TKO600; 3.55 posi; 13" Baer 4 wheel discs; 17" Billet Specialties wheels; Hotchkis/Koni rear; Ride Tech front; Classic AutoAir AC and power windows cuz I'm old and lazy!
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post #3 of 5 (permalink) Old Sep 13th, 09, 09:45 PM
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Re: power and ground connections for AC and cooling fan

2.0 sq mm is a fusible link that will protect a 10g wire (its a 14g link). I have all my main power wires protected with their own fusible link 4 sizes smaller (as is recommended on the MAD Electrical site). These all connect to 1 of 2 insulated studs (CN-1). One is on the firewall and has the alternator charging wire, main dash power wire, a/c system power, battery charging wire and the remote sensing wire from my alternator. The other is on the radiator support (near where my regulator was) and has the power wire for my electric fan, headlight relays and the power feed from the stud on the firewall. As noted above each power wire has its own fusible link.

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post #4 of 5 (permalink) Old Sep 14th, 09, 04:05 PM Thread Starter
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Re: power and ground connections for AC and cooling fan

Thanks guys! Both the AC and fan have relays that came with them. The AC has a circuit breaker too. What I'm doing different is simply using the 14ga fusible link from the battery to the CN-1 as the power wire. The AC and fan then attach to the CN-1. My concern is that the fusible link isn't a big enough gauge to supply the AC and fan concurrently. Thoughts? I don't think this fan has the power requirements of the Lincoln fan, but I'm not sure. With the AAW system the alt charging wire and main power wire have their own fusible links and connect to the battery at the starter, so they're protected and don't pull power through the CN-1.
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post #5 of 5 (permalink) Old Apr 14th, 10, 09:51 AM
Dan
 
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Re: power and ground connections for AC and cooling fan

Quote:
Originally Posted by barryfrise View Post
Thanks guys! Both the AC and fan have relays that came with them. The AC has a circuit breaker too. What I'm doing different is simply using the 14ga fusible link from the battery to the CN-1 as the power wire. The AC and fan then attach to the CN-1. My concern is that the fusible link isn't a big enough gauge to supply the AC and fan concurrently. Thoughts? I don't think this fan has the power requirements of the Lincoln fan, but I'm not sure. With the AAW system the alt charging wire and main power wire have their own fusible links and connect to the battery at the starter, so they're protected and don't pull power through the CN-1.
Barry, I'm at the same point in my electrical setup as you are and have the exact same question. Did you ever get an answer?

Dan
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