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The instructions for the connect and cruise say this:
A cooling fan is controlled by the ECM. Control is set to turn on a 12 Vfan at 97 Deg C (207 Deg F) coolant temperature. The fan control wireis fused/relayed and must be connected directly to your fan
Can I run 2 fans off the single blue wire.
I also have questions about controlling the fan with a/c.
This is in a 67 Nova.
I'm looking for help from someone thats done this
New to forum, probably questions covered elsewhere, but grateful for any advice or wisdom.
Installing GMPP connect and cruise. Used Tanks inc tank, pump and installed relay for fuel pump.
Also planned for C and R racing radiator with dual fan set up with one relay per fan.
GMPP fuse box and relay center has single relay for fuel pump and single relay for fan, one wire exiting box for each.
My question are: 1) should I scrap the external relay that I already installed for the fuel pump and use the associated wire and relay in the GMPP fusebox as this will be controlled by the ECM? I think scrap my external relay?
2) Next question is related to the advice above about a second relay for the fan, as only one relay in the GMPP fuse box relay center.
Should I wire one of the fans to the relay wire coming out of the GMPP fuse box and then run one of the 2 external relays to the other fan? and if I do this, how does the second /external relay get the signal from the ECM to turn on?
Thanks really grateful for wisdom from those much more experienced than myself
1) Why do you not want to use the GM fuel pump relay for the fuel pump?
2) Use the fan relay to control the 1st fan. Then connect the coil (terminals 85 and 86) of the new relay (for the 2nd fan) to the 1st fan. When the 1st fan comes on it will power the new relay. Connect the new relay terminal 30 to a fuse, with the other side of the fuse going to +12 volts.
Relay terminal 87 will go to the + fan wire. The other fan wire will go to ground.
Jim thanks for reply tried to reply back but message came up about having to be approved by the webmaster prior to posting. grateful for your help.
Bill
with respect to the fuel pump relay, I had already roughed in the tanks inc relay prior to the arrival of the fuse/relay box associated with the connect and cruise ecm. I did not know that it came with relay for fuel pump. If I understand correctly your advice would be to remove the tanks inc relay, and run a positive from the pump in the tank through the firewall to the fused/relayed lead coming out of the fuse/relay box as pump is grounded in trunk.
with respect to the fans, I understand powering the first with the fuse/relay box lead for fan.
looking at the SPAL relay, I have 4 wires:+12V battery, Fan+, ignition, sending unit.
I understand powering the relay via a 30 A fuse via the +12V battery wire. I understand powering the fan with the Fan+ wire. I do not understand how to connect the two relays and where.
Do I connected them via the sending unit wire, by splicing before the fuse relay box?
which wire do I use to ground the relay the one labeled ignition?
Again grateful for help, I am enjoying learning thanks
Bill
Bill, yes I'd remove the relay that came with your tank and use the one that is part of the GM fuse block.
Let's revisit the 2 fans....
1) do you want the second fan to run when the first fan starts?
2) do you want the second fan to only come on when the AC is switched on?
3) do you want the second fan to come on when either the 1st fan starts or when the AC is switched on?
What Spal relay and sending unit are you using? Got a link?
SPAL FRH relay, 4 wires 12v+from battery in via 30a fuse, +out to fan, sending wire, and ignition wire.
SPAL fans twin 11 inch SPAL 2VA06-AP70/LL-37A 12V read elsewhere that both fans pull max of 30amps?
blue wire labeled fan leaving GMPP fuse/relay box has 30 amp fuse, so as per your prior recommendation max amperage pulled is not less than circuit set up for. So probably need second relay.
No AC on this rig, would just like to have both fans fire at the same time.
How best to power second relay?
1) straight from battery with attached fuse or from the accessory stud on fuse/relay box set up for 50a fuse and change to 30 fuse?
How to connect first relay to second?
1) can I use the grey (sending unit wire out of SPAL relay) and splice with blue power wire out of fuse relay box power first fan, and if so what shall I do with the orange ignition wire from the SPAL relay?
Have tried to upload pictures but needs approval by "webmaster"
Again thank you , Bill
You need more posts, then approvals won't be needed, same for posting pics.
Here is the easiest way to wire the second fan.
The GM temp sensor in the head will control the GM relay for the first fan, this will also control the second relay.
Let me know if you have any questions.
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connect and cruise fan 
