According to the manual I am referring to the stop relay should have these color wires going to the socket.
Red w/ blue stripe = Hot wire for the relay coil
Brown = ground for the relay coil. This one goes to the controller that you verified earlier is working on that end.
Red w/ black stripe = Hot wire coming from fuse number 4
Blue w/ yellow stripe goes to the hold side of the stop solenoid.
After turning switch to start and back to on, check for power on the Red W Blue Stripe wire. This should be done with light clamp on a good ground.
Then confirm the Brown wire is giving the signal by checking power with the light clamp on the positive side of the battery.
If the light comes on for both test above then the relay should energize. You should be able to feel the click if it is hard to hear over the other relays. If one of the test fail you need to trace that wire back to the control or fuse.
Next test is to test Power on the Red w/black stripe. This is done with the test light clamp on a good ground.
Then test power on the Blue w/ yellow stripe. Again the light clamp should be on a good ground.
If the above test passes, you should have Power as long as the switch remains in the on position. If the first part of this test fails then you need to trace the red w/black stripe back to fuse 4.
If the second part fails the relay is not working and you need to confirm it energized. If it did then the relay needs replacing.
Hope that helps!
