HanSolo
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- Sep 11, 2012
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I got a new hour meter for my '74 M700. Installed it but it doesn't appear to be woking. Does the positive voltage come off the ignition system or is it routed through oil pressure sender?
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flyerdan
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Unlike most automotive oil pressure swithces which complete the ground, it looks like this one has a NO and NC pole so it can run the idiot light and Hobbs at the same time. That's how I would have done it if I was doing a design.
OK, I've tried every conceivable way to put a picture in here and it won't work, so here's a link to the section of the wiring diagram that cover it.
OK, I've tried every conceivable way to put a picture in here and it won't work, so here's a link to the section of the wiring diagram that cover it.
OP
OP
HanSolo
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So, to confirm proper pressure switch operation - with the engine running I should meter 12V from the NO terminal to ground, correct?
[email protected]
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its a 74. why even put an hour meter in it?
It's routed through the pressure sender so just in case you leave the key on and the engine is off, the hour meter will not keep ticking over.
[email protected]
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while we are on the topic of hour meters, my machine had 990 on it when i bought it. i've used it MAYBE 5 hours and it's up around 1,010. do i need a new meter?
OP
OP
HanSolo
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It's got a fresh rebuilt motor so keeping track of operating hours is important to me.
1ofU
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Hello,
i have my meter wired to my key switch ,
OP
OP
HanSolo
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I did end up wiring the hour meter to the key switch. Metering the oil pressure sender I saw odd values 2.5V. It's probably shot.
mahans7
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- Aug 22, 2012
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Tom, you may want to check how your meter is wired. If its wired through the key, the hours may not be accurate. My wiring on my 743 is all messed up with no fuses wired in, but I'm slowly getting there.
