I think ground strap goes from frame to bellhousing on right side. No, those wires are not correct, but they could work. No insulators should be used. Each plug needs 12 volts. A wire from the relay to one plug and then jumper wires to the other 3 is fine.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13