- 753
- 1,332
- 93
- Location
- Highland, Indiana
Is this plug missing something? The switch in my hand leads back to an air tank in bed. But no compressor. Looks like it was filled through a Schrader on top. Anyone see this before? Thanks for any help.
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M1028 plug and air tank in bed.
- Thread starter Mattguy
- Start date
Keith_J
Well-known member
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- Schertz TX
Looks like the holder for the glow plug card. The air tank is something the prior owner added.
- 753
- 1,332
- 93
- Location
- Highland, Indiana
I got the truck direct from the USMC. They added the tank. The rectangle plug is for a glow plug controller? I've searched all tm's and can't find this plug on a wiring harness for dash.
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- Camp Wood/LC, TX
Usmc must have had an air horn added from a 5 ton etc.
- 753
- 1,332
- 93
- Location
- Highland, Indiana
Found this relay added in. Would that be because the glow plug controller is missing. They did add a huge siren.
- 753
- 1,332
- 93
- Location
- Highland, Indiana
You are correct! Followed air line to two tone horn in grille.
Keith_J
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Wiring diagrams are function specific, glow plug controller card is found in the -34 TM appendix E-7. Thanks for making provenance clear. How many crayons did you find under the seat? Ammonia works well to clean the spittle from the windows 
M1009_SPAIN
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the empty plug is for the glow plug controller board.Found this relay added in. Would that be because the glow plug controller is missing. They did add a huge siren.
You have the spark plug relay in the firewall to the right of the one that the horn was connected to, it is identical
- 753
- 1,332
- 93
- Location
- Highland, Indiana
So they put a relay for the glow plug on firewall? I do have a switch on the dashboard that I thought was for manual glow plug operation.
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- Charlotte NC
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The dash switch is where somebody bypassed the factory way of turning on the glow plugs
M1009_SPAIN
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- Spain
Exactly, it was easier/cheaper for them to make a manual drive, than to install. a new glow plug controller board.
It is a very common process, do not be alarmed