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I agree with Michael... it looks like you have a switch bypassing the entire relay, that's not good. What you need to do to keep it manual is eliminate the white wires entirely and run a wire from the post with the blue wire to a momentary switch, and from the switch to ground. Later, Joe

Ok, I retract a little bit of my last post... the only thing that is NOT correct on that GPR is whatever the white wires with the yellow terminals are. Where do those go? They are not part of the original wiring. Later, Joe

That is the glow plug relay, it should show 24V on the top post and nothing on the bottom as you describe when they are not engaged. To test the relay, ground the blue wire and the relay should click and you should get 24V on the other post. That 24V should quickly decrease to about 14 or so...