LS1 fan swap ?? Relay hookup

[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.....

[Minime168]

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

[George C]

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

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.....

[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!!!

[George C]

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

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!!!

[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....

[George C]

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....

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.