I mean on my vehicle I see NO ground strap at all, only a second black wire from the left hand "temp relay thing" that goes to plug number one. A possible ground?

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1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat