I'm not sure where the grounding strap is on my '84 but on the '85 its connected to one of the bolts on the tranny bell housing. I didn't think to look on the '84 but I will. Thanks. On a side note, I made a thread a couple of weeks ago about my #14 fuse blowing on my '85 before it was wrecked. I replaced the nss and it made no difference. When I was pulling it to put it in the '84 I found the problem. Whatever wire it is that runs to the back of the tranny had worn through and almost in half and was touching the pan, creating the short that would instantly blow the fuse. When I was looking under on the '84, this same black wire had a nick in it. You could see a couple of wires through the insulation. If anyone else with a similar model is having trouble with their reverse lights, check this wire. Its a single black wire that runs to the back of the tranny.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo