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Old 11-19-2013, 12:21 PM
Topp dawg Topp dawg is offline
TT Enthusiast
Join Date: Jun 2013
Boat: 2003 Mastercraft X10
Location: Southeast
Posts: 280
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.
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