I've searched for this and can't find the answer.

When creating the wires for the loop to pencil glow plug upgrade, what length to you make the wires? Also, as far as I can see, 10AWG wire is what's needed. Does that sound right?

Thanks

10 awg seems reasonable for the thickness of the wires on my 84 & 85 300D glow-plug wires, but 12 awg would probably work too. Use wire rated for oil immersion. As to length, each one is a different length. Can't you just cut them as you install? You could grab a harness from a junkyard as a guide. For the plastic sheath they run in, search "PVC 105" from "SPC Technology" or "Alpha" on ebay. You need larger (~1/2"D), but that will get you in the neighborhood. I use it on when rewiring my 60's cars, or you could use "split loom", but I think it is ugly and hard to keep clean.

__________________
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Measure the total length of the Glow Plugs.

Figure the length of glow plugs in the pic and work out a formula for the wires from the Pic by comparison.

Also there is no harm if the wires are longer you can easily measure the length with the Glow Plugs installed.

Attached Thumbnails

 

__________________
84 300D, 82 Volvo 244Gl Diesel

Are they expensive to buy already made up? Wires?

I am not sure the kit is for sale anymore. Also when they did have the kit it came with a realy in it. That upped the cost.

Bosch at one time had a kit with just the plugs and the wires.

Attached Thumbnails

 

__________________
84 300D, 82 Volvo 244Gl Diesel

Maybe more info here.

http://www.peachparts.com/shopforum/diesel-discussion/331119-glow-plug-conversion-kit.html

__________________
84 300D, 82 Volvo 244Gl Diesel

Thanks. Makes sense. Never knew there was so much information and types of wire and coverings. Even compatible with oil?? Who woulda thought?

Think you're confusing the factory newer pencil setup with a conversion from loop GPs. There's 3 or 4 equal length "jumper" wires required, if the stock one to the fuse block is still ok.

Unfortunately I can't help OP as the setup I had on my car I transferred to another (never took pics of course), which recently led to a problem getting the engine usable again, I actually ended up using the remains of a 1984 factory GP wiring harness on my 1980 engine that originally had loop GPs...

__________________
1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD