Glow plug relay problems on a 95 ford 7.3l powerstroke.?

John

New member
I cannot get the glow plugs to work on my F350. When i turn the key on I have power to the two small leads on the glow plug relay and I have constant power to the one big lead but no power to the glow plug lead. I was told the relay is bad but I tried 3 brand new relays and they all do the same. Any ideas on what can be wrong? The truck has gone thru a frame off restoration. All electrics work except this problem.
 
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