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Old 11-20-2013, 09:19 AM
catamount catamount is offline
MC Fanatic
Join Date: Feb 2012
Boat: 1987 ProStar 190
Location: Vermont
Posts: 500
Originally Posted by Topp dawg View Post
My tach has a 5 wire plug.

7 volt power
12 volt power "for nighttime illumination only"
data "This is the one that tells the gauges what information to display"

The data wire can only be between 3 and 6 volts. I do not think a trickle charge method would work. I attached a picture from the medallion troubleshooting guide.
In that case I would go to my junk drawer of old cell phone chargers until I found one that was between 3 and 6 volts. Cut the leads off, hook to the correct posts and see what happens. Just make sure the output on the power adapter says DC of course.

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