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This is a good reason to read the first few chapters of the operators TM. It explains how and what happens concerning the Safety system

You are getting better!! Going to be a generator mechanic yet!

quick note. A2 has no switching function. The gen set runs just fine with no A2 in it.

The K20 coil, is in series with a set of normally open contacts from K15 and K16, and the LOP. Its not quite that simple, you need to look at the schematic. If Kurt can not write one up, when I get back home maybe I can.

In almost 30 years of fixing gen sets, I might have seen one S7 bad. Waste of time.

Have you tested the switch yet?

From Wire # Terminal # Terminal # Wire # From K20-7 102A A B 100AZ TB5-10 1 2 3 K15-6 119L 4 4 119H TB5-2 P4-1 127A 5 6 150D TB5-19 K20-A 102A 7 7 102B K15-9 J7-5 126B 8 8 126C J2-a TB5-2 119A 9 Wire diagram for K20

2-90.1. Testing the LOP. a. Shut down generator set. b. Open left side engine access door. c. Tag and disconnect low oil pressure switch (1, FIGURE 2-25) electrical leads. d Set multimeter for ohms and connect across switch connector pins C and NO. Multimeter shall indicate open circuit...

Testing the K20 relay. When not energized: Pins 7 & 4, 8 & 5 and 9 & 6 should be open. Pins 7 & 1, 8 & 2 and 9 & 3 should be closed. When the relay is energized: Pins 7 & 4, 8 & 5 and 9 & 6 should be closed. Pins 7 & 1, 8 & 2 and 9 & 3 should be open.

Keep in mind, K20 may be working right. Before pulling the relay out, connect your multimeter to K2-A and B. set the meter for VDC. Start the set. Do you get 24 VDC? If not, then the problem is someplace else.

Test K20 by the -24 TM. A quick way to test it is to see what other relay moves on start up, and swap them.

Correct. You can also jump from K16-8 to K20-8.

All wires are marked with wire numbers. find the right numbe, hook it to the right place. Also, I made a mistake. Wire #126A is connected to NC!! Its midnight here. My only excuse.

You assume wrong. Why do you think that you have to hold the start switch up in the first place, other then to engage the starter? When S1 is held up, all engine saftys are bypassed. That meant for the oil pressure switch, that the oil pressure comes up. Then when the oil pressure is high enough...

Try looking at the door of your gen set. There is the schematics on it. locate OP, the LOP, Low Oil Pressure switch. Notice that it has two wires connected to it. Wire #143C is connected to C and wire #126A connected to NO. The TM's are your friend.