[dayj1]

Ben,

In post #35, you said that only one fan comes on when you ground the control line (pin 85) of relays 1 and 3. In post 38, you said the fan that comes on is the one on the left in the diagram.

I'm making one assumption (so tell me if it's wrong). The assumption is that relay 2 and 3 still have their control lines (85) wired together. So when you ground the control for 3, you're also turning on relay 2.

If that's the case, then the problem is either:

1) The fan on the right in the diagram is bad.
2) Relay 1 is bad
3) The normally closed contact on relay 3 is bad
4) The wiring from pin a of the fan on the right to pin 30 of relay 3 is open
5) The wiring from pin b of the fan on the right to pin 87 of relay 1 is open
6) The wiring from pin b of the fan on the left to pin 87a of relay 3 is open

You've assured us that "1" and "2" above are covered.

To test number 3, pull the 5 pin relay (3) out of the circuit. Plug a jumper wire into the relay 3 socket to short pin 30 to pin 87a. Turn the ignition on and ground the control line (pin 5) of relay 1 only. If both fans come on, the problem is relay 3.

If both fans still don't come on with the above test, leave the jumper in place in the relay 3 socket. Ignition on, engine off, ground the control line (85) for relay 1 only. Measure the voltage between a good ground and all the following connections.

1) pin 30 of relay 1
2) pin 87 of relay 1
3) pin B of the fan on the right
4) pin A of the fan on the right
5) pin 30 of relay 3 (even though there is a jumper still in the socket)
6) pin 87a of relay 3
7) pin B of the fan on the left

Then post what all those voltages readings are.