Radiator Fan Relay Out?

I know there is a modern replacement since I replaced mine years ago. They are part number 896H-2AH-D1. If you want I can take a photo with my phone and send it via your phone if you want to PM me your number.

If the relay clicks and the light comes on, then the relay (for that fan) should be working as the light wire is connected to the same relay output terminal as the fan. Check for voltage at the fan positive terminal (wire) to ground (not the fan housing). If ok, then you probably have a bad fan or a bad ground. You will need to jumper the fan thermostat for this test.

You can also connect a jumper wire from the fan positive terminal to the battery positive terminal to check the fan.

Check the color of the positive wire on each fan and find those colors at the fan relays. The colors will vary depending on year and what happened to be within reach at the factory. They will probably be blue and yellow or blue and gray. Jumper the thermostat(s) wires and measure the voltage at the relay output terminals. You could have a bad fan thermostat.

Keep in mind that a voltmeter is a very small load and can show voltage present at a wire or terminal, but when a large load is applied, that voltage reading could go to zero if there is a bad connection somewhere (or bad relay contacts) upstream of the measuring point.

John

Thank you both for the replies, I will try some of the things you posted tomorrow. I figured the thermostat for the fan was working since the relay for the fans doesn't click until it reaches over 180 degrees. Contacts could be an issue as the fans weren't working until I installed the new Fuse Panel, then it started working again.

As with most of the Pantera electrical system, the fan relays can be disassembled and cleaned, by unbending the tabs that hold the steel case to the plastic base. The relays are mounted with the terminals upward, which makes access to the connections easy but provides a raised lip that collects water. The water then seeps inside the relay and corrodes the contacts. After cleaning and reassembling, swivel the relays on their stud so the wire connections point downward; less convenient for trouble shooting but also less apt to collect water.

The good news is I found the source of the problem and it was a disconnected ground wire and not the relays. The bad news is that while investigating the wiring I found that both wires to the fans were spliced together and run through the one pink wire. So I need to separate them onto the separate relays.