My 2000 Dodge Dakota has a continued issue with melting Relay #2 (Rad Fan Relay). The Relay will burn out on hot days when the A/C is running. As soon as the relay burns out the car shuts down and will not start. The term "No Buss" appears on the the odometer. I then have to replace the relayed and the PCM to start the truck normally.

Thank you.

 

You have to replace the PCM to get the truck to start again?????

The relay is having more of a draw than it is rated for pulled thru it. So, there is either a short in the wire between the relay, and the fan, or, the fan motor is going south.

 

I have not yet replaced the PCM yet, this just happened over the weekend. Once the Relay burns out the electric radiator fan run constantly until turn the car off.

 

Need to see what kind of load the fan is putting on the relay.

 

What is most efficient way to test the load on a relay?

Thank you for your help!

 

Put a meter than can deal with a 30 amp or better draw inline in the circuit.... Your typical volt meter won't handle that kind of load though..... Maybe you can rent something from the parts store?

 

Last night I replayed the relay however the odometer reads "No Buss" and the truck will not start. Is it possible to test the Fans Load without staring the truck?

 

Shouldn't that circuit have a fuse and shouldn't the fuse blow before the relay melts? If I'm right, check the fuse to see if the incorrect fuse (high amp) is installed.

That said, I agree that it might be the fan motor going bad and drawing too many amps.

 

How can I test the Fan AMPS without starting the truck. The odometer is still stuck in "No Buss" mode.

 

Need to find out why you are getting the no bus error. Generally, that's a failed sensor on the 5 volt side of things. (tps, O2, coolant temp, etc.)