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608KEB

520H hour meter doesn't work

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I have a 1994 520H. The hour meter works if I take a ground wire from another ground source. I looked through the 520H wiring diagram and found that the hour meter ground runs into the oil pressure switch. I have taken the 9 pin connector apart. It's in good shape. I cleaned it and used electric contact grease. When I turn the key to on, I noticed that the oil pressure warning light does not come on. I'm guessing that the ground running to the oil pressure switch is at fault. Is this correct or are there other possibilities?

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Edited by 608KEB

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First, check your fuses. If it is the same setup as my 416-H, the oil pressure switch has two circuits. One is closed when the engine is off and until the oil pressure reaches 5 psi. That causes the oil light on the dash to flash when the key is turned on, and until the engine is started and oil pressure builds up. When it reaches 5 lbs, it opens turning off the light. At the same time, when the oil pressure reaches 5 lbs, the other circuit closes. This connects the ground side of the hour meter.

If the oil light does not come on with the key on and engine not running, I would suspect that the switch has gone bad.

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When the key is turned on the oil warning light does not light up. Do I remove the shroud to get at the switch? 

Edited by 608KEB

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Did you ever figure this out? No ground at the hour meter. But the light blinks when the key is on/ engine off. Trying to fix the faulty ground at the hour meter without disturbing the original wiring

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Posted (edited)

No, I never did figure it out. I put a new oil pressure switch in. I didn't know how to test the switch. To see if it opened and closed properly. It's supposed to open between 2 and 5 lbs of oil pressure. The hour meter does work as it should now. So it wasn't grounded. But when I turn the key to on, the oil pressure switch light does not flash.

Edited by 608KEB

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