Yes the firewall connection is on plug # 5.

Heres what i know.

I connected plug 5 to the firewall connection only, I did NOT connect to the other 4 plugs. The light on dash came on and plug got hot.

I then connected my jumper wire to 5 but didn't connect it to 4, i had 12V. I continued with the other plugs.

If all glowplugs are connected then the light on dash doesn't come on, and NONE of the have power. If i disconnect a jump wire the light comes on and I have power to all other plugs that are connected.

Yes, the system worked fine before I touched it.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg