HanSolo
Well-known member
- Joined
- Sep 11, 2012
- Messages
- 299
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?
So, to confirm proper pressure switch operation - with the engine running I should meter 12V from the NO terminal to ground, correct?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.
its a 74. why even put an hour meter in it?So, to confirm proper pressure switch operation - with the engine running I should meter 12V from the NO terminal to ground, correct?
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.its a 74. why even put an hour meter in it?
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?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.
It's got a fresh rebuilt motor so keeping track of operating hours is important to me.its a 74. why even put an hour meter in it?
Hello,It's got a fresh rebuilt motor so keeping track of operating hours is important to me.
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.Hello,
i have my meter wired to my key switch ,
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.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.