If you look at the battery there is a plastic cover directly behind it. It should just pull out. You don't need to remove the battery to get to the ovp relay (maybe you should?) I didn't. It is on the right side of the two giant wiring harness plugs. It is bolted to the car. That bolt was miserable to try and get out. I bought a new one and it rides around with me but I didn't install it. I just unplugged the original ovp and wire brushed the male end.


My symptoms for the ovp were crank but no start...engine wouldn't turn over but the starter was spinning but it wouldn't catch.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg