LS1 fan swap ?? Relay hookup

I put a set of 4th gen F body fans in my 04' Colorado, I bought a set of relays and have been messing with them for two days now. I can't figure out how they are supposed to be wired up, hope somebody can save my sanity, I am slo using the ECM to control the fans. (green wire and blue wire from PCM)

Relay diagram Instructions

orange- relay coil feed (applying voltage to this wire activates the relay coil.)

Black- grounds relay coil

Blue-normally open (has continuity with common red wire with voltage applied to relay coil feed orange wire)

Brown- Normally closed (has continuity with common red wire with "NO" voltage on relay coil feed orange wire.

Red- Common with blue or brown wire depending on voltage present on coil feed orange wire.

I had the black wire grounded to battery, red wire direct to + of battery with 30 amp fuse, brown wire I wasn't using, blue wire I had to + of fan, orange wire I had to the ECM wires. I grounded the - of the fans to the battery as well.

I can't get the fans to come on via ECM signal, after researching tonight I found out the ECM signal is actually a ground, so that is one mistake I made so far. I tried several ways of hooking them up, and could not get them to work correctly.....

The ECM provides ground. So you need to have the relay to be excited by ground and constantly have its positive on instead.

http://img132.imageshack.us/img132/8...ring3relay.gif

Quote:

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Originally Posted by TRPLXL2

I put a set of 4th gen F body fans in my 04' Colorado, I bought a set of relays and have been messing with them for two days now. I can't figure out how they are supposed to be wired up, hope somebody can save my sanity, I am slo using the ECM to control the fans. (green wire and blue wire from PCM)

Relay diagram Instructions

orange- relay coil feed (applying voltage to this wire activates the relay coil.)

Black- grounds relay coil

Blue-normally open (has continuity with common red wire with voltage applied to relay coil feed orange wire)

Brown- Normally closed (has continuity with common red wire with "NO" voltage on relay coil feed orange wire.

Red- Common with blue or brown wire depending on voltage present on coil feed orange wire.

I had the black wire grounded to battery, red wire direct to + of battery with 30 amp fuse, brown wire I wasn't using, blue wire I had to + of fan, orange wire I had to the ECM wires. I grounded the - of the fans to the battery as well.

I can't get the fans to come on via ECM signal, after researching tonight I found out the ECM signal is actually a ground, so that is one mistake I made so far. I tried several ways of hooking them up, and could not get them to work correctly.....

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I appreciate the reply guys, but I managed to figure it out tonight after another 4 hours of troubleshooting.. Basically the instructions that Ron Francis gave with their relays sucked, following those Is why I couldn't get it to work. I ended up following a chart off of LT1swap.com, I basically ignored colors and just ran with following numbers of the relay. First attempt and they work, so I soldered them up and made some adjustments in HPTuners and they're good to go!! Here's how I wired them for future reference:

terminal 30-87a (jumper wire connecting the two)
terminal 30 & 86 (battery + 25 amp fuse)
terminal 85 (ecm signal wire)
terminal 87 (+ cooling fan)

I just grounded the fans to the battery, and presto!!!

if you click the link i provided it is a diagram of how the relays are wired

Quote:

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Originally Posted by TRPLXL2

I appreciate the reply guys, but I managed to figure it out tonight after another 4 hours of troubleshooting.. Basically the instructions that Ron Francis gave with their relays sucked, following those Is why I couldn't get it to work. I ended up following a chart off of LT1swap.com, I basically ignored colors and just ran with following numbers of the relay. First attempt and they work, so I soldered them up and made some adjustments in HPTuners and they're good to go!! Here's how I wired them for future reference:

terminal 30-87a (jumper wire connecting the two)
terminal 30 & 86 (battery + 25 amp fuse)
terminal 85 (ecm signal wire)
terminal 87 (+ cooling fan)

I just grounded the fans to the battery, and presto!!!

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Currently I have no AC setup, so that Is why I didn't setup the 3 relay setup. I think we are going to do Vintage air down the road next year, they're gen 3 Sanden setup is very nice. Prices where I'm at are ridiculous for the LS1 stuff, and used ac compressors go for about $150. I do appreciate the help though....

Quote:

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Originally Posted by TRPLXL2

Currently I have no AC setup, so that Is why I didn't setup the 3 relay setup. I think we are going to do Vintage air down the road next year, they're gen 3 Sanden setup is very nice. Prices where I'm at are ridiculous for the LS1 stuff, and used ac compressors go for about $150. I do appreciate the help though....

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ill have a truck ac compressorr and bracket for sale if you need it. from a 00 motor setup.....yes truck ac will work with fbody accesories, you just need to enlongate the holes on the bracket some.