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Author Topic:   Connecting a Volt Meter

Jiles posted 10-09-2002 03:01 PM ET (US)
How can a dash mounted volt meter be hooked up to a 40 Johnson motor?
rapidrobert posted 10-09-2002 05:09 PM ET (US)
Does your setup include a battery? If so hook the voltmeter up across the battery terminals, or to any (+) and (-) terminals in the console.
whalersman posted 10-09-2002 06:42 PM ET (US)
Jiles,
rapidrobert is basically correct and this will work, however, It would be better to run the power wire through a wire that turns ON and OFF with the Ignition Key or Switch.
On OMC, the Purple wire is used for the Key Switch "ON" and this is the one you should use. Now, when you turn the Ignition Key OFF, the Volt Meter will also go OFF and will not drain the battery if you happen to forget to turn the battery switch OFF if you have one.
We all are assuming here that you have an Electric Start 40 HP Johnson that has a battery connected to it and you have an ignition switch somewhere on the console or throttle control unit.
jimh posted 10-09-2002 08:05 PM ET (US)
Good point about wiring the voltmeter through the ignition switch to avoid discharge.
rapidrobert posted 10-09-2002 09:11 PM ET (US)
good point whalersman!
JohnAz posted 10-10-2002 10:42 AM ET (US)
I hava a dual battery's on 2 40/hp omc's one volt meter and use an on/off/on switch wired seperate form the igintion sylstem to check voltage "before" turning on the ignition switch, it is also wired to the fuel gauge to check fuel level,,I just have to remember to turn it off when shutting down,,not a problem

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Author	Topic: Connecting a Volt Meter
Jiles	posted 10-09-2002 03:01 PM ET (US) How can a dash mounted volt meter be hooked up to a 40 Johnson motor?
rapidrobert	posted 10-09-2002 05:09 PM ET (US) Does your setup include a battery? If so hook the voltmeter up across the battery terminals, or to any (+) and (-) terminals in the console.
whalersman	posted 10-09-2002 06:42 PM ET (US) Jiles, rapidrobert is basically correct and this will work, however, It would be better to run the power wire through a wire that turns ON and OFF with the Ignition Key or Switch. On OMC, the Purple wire is used for the Key Switch "ON" and this is the one you should use. Now, when you turn the Ignition Key OFF, the Volt Meter will also go OFF and will not drain the battery if you happen to forget to turn the battery switch OFF if you have one. We all are assuming here that you have an Electric Start 40 HP Johnson that has a battery connected to it and you have an ignition switch somewhere on the console or throttle control unit.
jimh	posted 10-09-2002 08:05 PM ET (US) Good point about wiring the voltmeter through the ignition switch to avoid discharge.
rapidrobert	posted 10-09-2002 09:11 PM ET (US) good point whalersman!
JohnAz	posted 10-10-2002 10:42 AM ET (US) I hava a dual battery's on 2 40/hp omc's one volt meter and use an on/off/on switch wired seperate form the igintion sylstem to check voltage "before" turning on the ignition switch, it is also wired to the fuel gauge to check fuel level,,I just have to remember to turn it off when shutting down,,not a problem