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#1
12-03-2008, 04:59 PM
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617.952 Tachometer
Does anyone know where exactly the wire for the tachometer runs? i am having a strange problem (it might be related to coolant spraying out in my engine compartment from a leaking thermostat housing). since this happened my ABS light comes on and my tach works, but if i hit any bumps in the road the light goes off and the tach quits working. it sounds like it would be a loose connection because it constantly goes on and off but i just dont know where to look. not to mention i dont know why the tach and abs would have any sort of relation. thanks.
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#2
12-03-2008, 05:22 PM
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The tach in an '85 is connected to the EGR computer. I don't know where it is in an SD. The tach signal comes from a sensor at the rear of the engine. The common thread may be the overvoltage protection (OVP) relay or its fuse. The OVP relay in an SD is in a box near the fusebox, according to the 1985 "Introduction into service" FSM. In addition to possible corroded contacts of the relay and its built-in fuse, the little circuit board in the OVP can develop cold solder joints over the decades. I would check the OVP first.
Doesn't the SD have a 617.951 engine? Jeremy
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
12-03-2008, 09:10 PM
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Quote:
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Bob '82 300D Petrol B-G Metallic
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#4
12-05-2008, 07:57 PM
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The problem seems to be a loose conection or something minor because it works on and off in short amounts of time and when i hit bumps.
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#5
12-05-2008, 08:15 PM
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ok so from what i have gathered my OVP relay must be bad because the fuse on top of it is intact. can you actually take the cube apart and fix the solder joints?
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#6
12-05-2008, 09:52 PM
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Some folks have reported success, yes, but I have no experience with the procedure.
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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