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Does anyone have a schematic for a mep701a? I am still using the mep016b as a guide. I am working backwards to solve the battery charging problem. While running should I get an AC reading between #3 and #4 on the A1-TB2 board? How do I if the stator is working?

I went over the entire fan circuit. Finally, I pulled out a spool of red, black and white wire and replaced all of the wires in the circuit. Fans work great! Now on to the DC charging system. I have looked all over the internet for an actual mep701a schematic. I have had no luck. The one TM...

My 701a has no schematic inside or outside of the control box, I have been using the closest schematic I can find. I am sure having an actual 701a drawing would help. Thanks again!

No voltage at fan terminals. Charging system is not working either, must be related.

I see that, the fans do not run. Should I be able to jump them off the battery?

Okay, I got the thing running, turns out I did have a second bad diode. Thanks Triple Jim! and to everyone else. I am getting no output on the DC charging system, and are the fans on the mep701a supposed to come on right at start up? Miner never came on, and I don't see a temperature switch...

W8BUH, hang on to those solenoids. I finally found one, out of a dead unit. Triple Jim, here is the schematic.

It turns out it was not a diode, but a capacitor, CR14. The capacitor is marked AKK 522. I checked every connection and every wire, could a stuck relay cause that? I flipped all four relays. They are corroded, so I can't read what kind of relays they are. Here is a pic.

There are two floats on the fuel level tube. The bottom one is the low fuel shut off switch, the upper one is the aux fuel pump shut off switch. The bottom one can keep the unit from starting. I have an easy way to test it. Disconnect the wire to the fuel level tube. Unscrew the fuel level...

I will pull the board and post some pics tonight. Thanks for the help. Jon

Good news, the solenoid works just fine when I jumped it from the battery. I checked and re-checked the fuel level float switch. As a last resort I tapped on all the relays (k1,k2,...) Suddenly everything worked perfectly. Then about three minutes into running smoke puffed out of the board...

I had a chattering solenoid, my fuel level switch works, and now the solenoid does nothing. I pulled the plug, and only get 16 volts when I turn it to run. While I had the volt meter hooked to the solenoid plug, I moved my fuel level float up and down, and it would go from 0 - 16 volts. I...

did you check the fuel shut off solenoid? Try holding it in while turning it over. You should hear a loud clink when you turn the start switch to the run and or start position. Good luck!

If it is a 016b. (i have had three marked as 016b, but were actually 016es with the yanmar l100 engine) then it could be as simple as making sure the throttle is wide open. Do the fuel pumps make noise? or just click?

Did you get it going? Have you checked to make sure your fuel lines are in the right places. I had a mep016e that someone had swapped the hose positions on the tank. The fuel pump ran, but nothing ever bled out. I retraced the lines, and yahtzee! Good luck.