If I knew more about electricity I could probably figure this one out myself, but...

I was using a test light on my GP relay today to figure out why my 6.9 isn't starting. Of the four terminals on the relay 3 made the test light shine. The terminal that is connected to the positive battery post would not. Is this supposed to happen? Is this an indicator that the relay should be replaced and upgraded to the newer style?
I used the test light on the glow plugs earlier in the day and they all worked. Later, 4 of them no longer worked(thus the new 8 motorcraft gp's).

Oh, the fuel pump, injection pump, one fuel line, all 8 eight injectors, all the return lines have been recently replaced. Any thoughts would be appreciated.

 

I think Ziggsters page has the GP manual push button info...................

http://www.members.shaw.ca/k2pilot/

 

Where did you have the test light ground clip?

If it was attached to a ground, the battery terminal should always show hot.
The small black wire is a ground, so it would not.
The large terminal across from the battery terminal should show hot while the glow plugs are heating only.
The purple wire should show hot while the glow plugs are heating.

If you had it attached to the battery positive terminal,
The battery terminal on the relay would not light the test light.
The small black ground wire would light the light.
The purple wire would light the light, backfeeding the controller.
The large orange and white wire terminal would light the light unless all the glow plugs were burnt out as well as the indicator light in the dash.




Not the best picture, but it is the only one I have that is almost stock.

 

I had it clipped to the positive terminal of the battery.So, it acted just as Dave said it would. I will put in the Beru gp's and see what happens from there.

I do have a manual push button unit from the previous owner of this truck, which I tried yesterday. I'll post when I see the results from the new gp's, thanks.

 

Be very careful, do not hold the button too long. It will burn out the plugs. At one time I had a thin wire accross the button, so when they were too hot, so was the wire, you could not help but turn it loose in time.