MEP-003a Aux Fuel Solenoid problem

[coyotegray]

When running with the master switch set to aux and with the fuel level less than 3/4 I have 24v to one pin at the solenoid but it will not open. I have tried a know good solenoid.

When I check the other two pins there is no voltage and no ground..

I have checked between the pin that is 24v and the other two with negative results. I have also checked between them and ground with negative results..

Two wires run to the solenoid so I am assuming that one should be the negative lead..

Is this correct..? I have checked the TM and found everything else but info on this connector (J5 on harness 338-575) figure 1-4 in TM 5-6115-585-12.

And if this is correct, anyone know where the negative wire runs to..?

 

[Speddmon]

On your connector at the solenoid coming from the control cubicle, from the TM it looks like pin/socket "B" should be the 24 volts, and pin/socket "A" should be the ground. But, after pin/socket "A" there is a diode before it goes to ground. Diode CR3. it's possible that diode is open.

 

[coyotegray]

On your connector at the solenoid coming from the control cubicle, from the TM it looks like pin/socket "B" should be the 24 volts, and pin/socket "A" should be the ground. But, after pin/socket "A" there is a diode before it goes to ground. Diode CR3. it's possible that diode is open.

Looks like that was it.. It tested bad after removing some of the varnish and putting a meter on it but I jumped it to test and the solenoid opened and strangely after that the diode it started working fin on its own. Any idea on what I need to replace it with..?

Thanks,
Andy..

 

[Speddmon]

If it's working, I wouldn't mess with it. Could have been the varnish you removed allowed it to make a good connection again and start working. The manufacturer part number for it should be in the -24P TM. And a quick google search should bring up an electronics supplier to be able to purchase one through.

 

[coyotegray]

I ordered a replacement & spares from Delks. I don't want it to go out when I need it the most..

Thanks for the help..

Andy..