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79 300 glow plug conversion

786 Views 1 Reply 2 Participants Last post by  MB-Owner-in-ind
If you change the glow plugs on 79 300d, can you put the new style pencil plugs in and use the wire connetors so they are not in sequence?
Do you need the new relay to go with it or can you use existing?
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I have made the swap on my 77 and just went from the original hookup on the fire wall at the fuse to my #5 then #4 and so on. Be sure to remove the ground wire on #1. Work for me for 2 years now. You will find that the glow plug light stays on longer than the later years that came with this style but it hasn't hurt anything yet.
 
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