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If you had 24 volts at both K16-A and K16-B with S1 in Prime/Run and the engine was NOT running then it points to a possible issue with S14. S14 is on the far left of the row of relays. S14 is suppose to switch K16-B to ground causing K16 to pull in with S1 in Prime/Run and the engine was NOT...

When I gave the directions on things to probe you weren't suppose to put S1 in START, only to the Prime/Run position. I gotta sign off, go do some grilling and have dinner with the family.

I assume you heard the fuel pump running when you did those measurements? An I assume your meters negative lead was connected to a ground point.

OK, need to determine why K16 isn't pulling in when it should. Here is the numbering of the terminals on the individual relay sockets. It shows K16 but it's the same for all of the sockets. Terminals 4,5 & 6 are closest to the front panel on the lower row of the socket. Terminals 7,8,9 are...

We're getting closer. K16 has to pull in for the starter circuit to be enabled. Since it's not pulling the starter isn't going to work. Does K12 pull in with S1 in Prime/Run?

You indicated that the fuel pump runs with S1 in Prime/Run so S10 is not the issue. Do this with Dead Crank in NORMAL, Emergency Off Button Pulled Out and Battle Short OFF Open the panel and with a flashlight watch K16 as you move S1 from OFF to Prime/Run. When you move S1 to that position do...

Here is a picture of the relays with their reference designations and function

All the relays in the row are all the same EXCEPT the far left thing that looks like a relay

When you say it "won't start" do you mean the starter doesn't engage and turn the engine over or do you mean the starter turns the engine over but it wont fire? Do you hear the primary fuel pump run with S1 in the Prime/Run position? Try disconnecting my VR wire that you hooked to K15. Put...

Things to check... Make sure the Emergency Off Button is pulled out Make sure CB1 isn't tripped Make sure Battleshort is OFF Does the fuel punp run with S1 in Prime/Run? Do the panel illumination lamps work?

Installing the VR should have no affect on starting. The two wires you connect to M7 and K15 would not affect the starter motor from operating. Those two connections just pick up 24 volts and ground for the VR operation. I'll noodle on it though.

Here is a picture of the MWO "Fuse Mod" Guyfang is referring to...

Here is a diagram of which wires should be on S1 with their wire numbers and the destination of the wires in ( )

There should not be any wires on S1-6. Here is my S1. Ignore the two bright red wire lugs on my S1. They are not in a normal 831.

Now that I look closer the "MOSFET" is actually a diode since it's labelled D1. So you ought to replace D1 & D2.

The diode is definitely toast. If it were me I'd replace both the MOSFET and the Diode. The traces to J1 look a bit crispy too. Might want to see which traces that are crispy go to which pins on J1. Then determine where to pin on J1 go to to see if the is any damage along that path.

In this case basically a power transistor

My source is out of the S14's. However.... I will be producing them in a couple of weeks.

The big auction site has a 5930-01-023-4343 and some 5930-01-246-9266

Sent you a message ;)