Hour Meter, wiring to OEM oil pressure idiot light

AH64ID · 11-17-2006, 09:37 PM

So I am wanting to put an hour meter on my new truck and here is my idea for wiring..

Tap into the power for the OEM oil pressure light.. wire it to a relay then put the hour meter on the normally closed circuit, and the power coming from the acc position, when the key is on and the enigine isnt running the OEM light is on.. .hour meter wont be on... fire it up get pressure, light goes out.. hour meter comes on...

is my logic correct?

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EnolaGaia · 11-18-2006, 07:12 AM

What 'hours' are you wanting to measure or record? ... Seems to me your proposed setup should work if you're specifically interested in 'number of hours the engine is operating at or above threshold oil pressure'.

Off the top of my head, though, it seems to me it'd be a lot simpler to wire the hour meter to an ignition-specific circuit if you'd be satisfied with 'hours the engine is turned on overall'.

AH64ID · 11-18-2006, 07:24 AM

Quote:

Originally Posted by EnolaGaia

What 'hours' are you wanting to measure or record? ... Seems to me your proposed setup should work if you're specifically interested in 'number of hours the engine is operating at or above threshold oil pressure'.

Off the top of my head, though, it seems to me it'd be a lot simpler to wire the hour meter to an ignition-specific circuit if you'd be satisfied with 'hours the engine is turned on overall'.

Is your low oil pressure light illumintated when your engine is at idle? Mine isnt, as its not supposed to. So this setup would record time anytime the engine is operating, which is my goal. Wiring into the ignition circuit would be much more difficult as you would have to find something that only has power with the engine running, not just in the "on" position, otherwise you would clock engine time anytime you are just rolling the windows up or down with the engine off...

**Yoda** · 11-18-2006, 09:09 AM

If you are tapping into the wire between the light and the oil switch, I think it would work. (relay grounds through the switch contacts, opens the relay, hour meter stops)

We have lots of equipment with hour meters, and most are wired to an oil pressure switch of their own.

Some are wired to an ign circ, and we have probs with guys leaving the ign on to listen to the radio......the hour meter keeps ticking and we have to change oil (most equipment is on a 200 hour schedule). The equipment only have ign, no accy circuit.

reggie 00 · 11-18-2006, 10:35 AM

Not to question your reasons, but to find out if it is something that might benefit me also. Why do you want to run an hour meter? Like Yoda said on heavy equipment you do it to track maintenance because there is not odometer. what kind of preventative are you focusing on with the meter?

in other words whats the plan Stan?

2KTacoma · 11-18-2006, 10:51 AM

why don't you just use the tach signal wire to throw a relay to give power to the hour meter, thats how it rigged for both engines on our boat.

**Yoda** · 11-18-2006, 02:31 PM

We do have security vehicles that sit and idle for LONG periods of time. If I went by the odo reading on those, it would equal maybe a 10k mile oil change. Someone had done a study that said 200 hrs is aprox = to 3k miles, so that is what we plan.

Course, some of them come in for service 200 hrs past due

11-18-2006, 09:09 AM	#4 (permalink)
Yoda Super Moderator Staff Join Date: May 2002 Location: North Bend, WA Posts: 2,664	If you are tapping into the wire between the light and the oil switch, I think it would work. (relay grounds through the switch contacts, opens the relay, hour meter stops) We have lots of equipment with hour meters, and most are wired to an oil pressure switch of their own. Some are wired to an ign circ, and we have probs with guys leaving the ign on to listen to the radio......the hour meter keeps ticking and we have to change oil (most equipment is on a 200 hour schedule). The equipment only have ign, no accy circuit. __________________ David TLCA 14788 71 Landcruiser FJ-40 TBI 327, TH-350, Warn 8000, disk axle swap. 76 Landcruiser FJ-40 project/parts (haven't decided)

11-18-2006, 10:51 AM	#6 (permalink)
2KTacoma Registered User Join Date: Oct 2006 Location: Michigan Posts: 159	why don't you just use the tach signal wire to throw a relay to give power to the hour meter, thats how it rigged for both engines on our boat. __________________ --------------------------------------------------------------------------- Silver 2000 Toyota Tacoma Extended Cab V6 5spd SR5 Now with URD short shifter and Milled polyurethane shifter seat Hella FF1000 Driving Lights

11-18-2006, 02:31 PM	#7 (permalink)
Yoda Super Moderator Staff Join Date: May 2002 Location: North Bend, WA Posts: 2,664	We do have security vehicles that sit and idle for LONG periods of time. If I went by the odo reading on those, it would equal maybe a 10k mile oil change. Someone had done a study that said 200 hrs is aprox = to 3k miles, so that is what we plan. Course, some of them come in for service 200 hrs past due __________________ David TLCA 14788 71 Landcruiser FJ-40 TBI 327, TH-350, Warn 8000, disk axle swap. 76 Landcruiser FJ-40 project/parts (haven't decided)

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11-18-2006, 07:12 AM	#2 (permalink)
EnolaGaia Registered User Join Date: Jan 2004 Location: SW Ohio Posts: 284	What 'hours' are you wanting to measure or record? ... Seems to me your proposed setup should work if you're specifically interested in 'number of hours the engine is operating at or above threshold oil pressure'. Off the top of my head, though, it seems to me it'd be a lot simpler to wire the hour meter to an ignition-specific circuit if you'd be satisfied with 'hours the engine is turned on overall'.