GLOW PLUG RELAY QUESTIONS
 

Having some POWER to the GLOW PLUGS problems the last few weeks. Not working again. I'm thinking the pre-glow time relay is bad. Would there be power to the relay all the time when the key is switched on ? I know the relay shuts off after 30 seconds, but is there still power to it after that happens?

IIIRC the glow plug relay always has power. Did you check the fuse? It's on the top of the relay under the cover.

Yes. Same when the key is switched off.

Yes, there is power in the box. I'm off to the pick & pull.

There's actually two power inputs: one from the battery that is alway on regardless of key position, and a second from the switch that is on only in the run position. If you have a bad connection between the battery and the GP relay, or if your GP relay internal fuse is dodgy you might confuse this with a relay problem. Better to check the connections and operating voltages (voltages at the GPs when relay is energized, switched voltage to relay, ground connections, engine ground, etc.) first before replacing parts. Also, take the fuse out of the relay and make sure it is in one piece. Sometimes they develop a hairline crack that interferes with proper operation.