Mudfly | Re: Which Oil Pressure Switch? | |||
Charlie England | Re: Re: Which Oil Pressure Switch? | |||
Mudfly | Re: Which Oil Pressure Switch? |
Subject: Re: Re: Which Oil Pressure Switch? From: M Wilson (mike_tailwind@yahoo.com) Date: Tue Mar 26 - 9:26 AM You could modify Bob's latest overvoltage module to do what you need.=C2 - Change the trip point to 13.5 volts, and remove the SCR. >From schematic 9003-630-IP6:Change R7 from 13.7K to 11KRemove Q15Add a wire from U11B pin 7 to the enable input=C2- of the hour meter. What we don't know is how much current the enable input to the hour meter d raws.=C2- To test, place a 2.49K resistor between the enable input of the hourmeter and 12Volts.=C2- If it starts counting, no additional changes to the OVM need to be made.=C2-=C2- On Tuesday, March 26, 2024 at 08:34:33 AM CDT, Mudfly <shawntedwards@ho tmail.com> wrote: om> I've been away from electrical work on my project while I installed engine and related accessories.=C2- I'm reviving this thread on ways to activate a hobbs meter without using an oil pressure switch.=C2- I have an LED hobbs meter that I would like to wire so that it will display the hours when the batt switch is on , but not count time.=C2- I would like the timer to begin when engine is st arted. As a review from the previous threads above, I have a 3-terminal hobbs (+, -, and Enable).=C2- =C2- The positive terminal is fed from th e Main Power Bus when batt is switched, and negative to firewall ground bus . The LED digits illuminate with Batt switch on.=C2- I now need a way to power the Enable terminal to begin the timer.=C2- I have an idea but not sure of the part I need or if it even exists. Here the plan.=C2- The positive terminal will have the 12v input from the main power bus.=C2- Also, I will have a feed wire from the positive term inal to the "Unknown Device".=C2- The wire will continue from the unknown device to the Enable pin on the hobbs meter.=C2- =C2- The "Unknown Devi ce" will need to block power until volts are above batt voltage.. say 13V??.=C2- When the engine is started and alternator is switched on, power will pass the unknown device and power the enable terminal of the hobbs meter.=C2- =C2- Does this "Unknown Device" exist, and does the plan seem feasible? Links to PDF drawings of a simple wire diagram and also tech sheet of the Honeywell LCD Hour meter. Thanks for the help. Shawn Read this topic online here: http://forums.matronics.com/viewtopic.php?p=513410#513410 Attachments: http://forums.matronics.com//files/honeywell_lcd_hour_meter_173.pdf http://forums.matronics.com//files/hobbs_meter_117.pdf - S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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