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Troubleshooting update & still need sparky help!! Fuel pumps running problem has not been solved. Have eliminated the following items (either by electrical checks per TM or swapping out part with known good): --Battle short switch & start/stop/run switches --Day tank float switch...

Electrically those are similar, just 6 cyl big brother to the 198 in the MEP4 and of course more KW...are they close by? You got "some"?? If you need assist with pickup let me know...

OK, swapped out both start/run/stop switch and battle short switch--no change, pumps still running with DC breaker in & switches off...aua aua aua Still looking for breaks in wiring but none found so far. Next check will be the diodes in the rectifier assembly.....fun, fun, fun.....

START/STOP/RUN Switch checkout Conducted a check of known-good working MEP004A switch against the unit that has the fuel pumps running. Found a difference in resistance at some of the terminals--comparing between the two switches. Results of test below: The start/stop/run switch has two rows...

No prob Munchies--thanks for checking in. I'll keep slugging through the TM when I get the time. The stop/run switch (on the MEP4) could still be the culprit or maybe the battle short switch...These are quite more elaborate (in DC wiring) than the 002-003 units, so I'm still learning what I...

I'll take another look at it tonight. Thought I already checked the master switch but will check it again and trace wires connected to the switch as well. What's confusing though, when you turn on the master switch the low oil indicator light comes on like it should. It seems like if the...

Yep, I figured they're supposed to be at zero voltage unless the unit is either running or if the battle short switch is on. Still can't figure out the electrical maze of what's malfunctioning to send the voltage to the pumps when it's not supposed to be there. Also this is a new problem on a...

Peter, I finally had a little time to check out the wiring to the pumps and took a look inside the unit. First a few pieces of basic info I gathered: 1. Voltage across batteries: 25.60 volts 2. With all switches off, voltage to radiator end pump (from connector near pump): 22.46v (The wire #...

Peter, I've looked through both the Op & Depot Maint TMs and can locate fuel solenoids but no relays specific to the fuel system. Are you using the term "relay" to mean "solenoid"? Thanks

Thanks--I'll steer towards a stuck relay. And once fixed, I'll make it SOP to pull the DC breaker too. :)

Hi Peter...wanted to ask about an MEP-004 that we have that decided to start running one of the fuel pumps whenever the batteries are connected, even with the run switch & battle short switch off. My son called me the other day when I was out of town and mentioned to me that he heard a pump...