Question about GPS
If you can find the white junction box where the antenna is connected take a volt meter and measure across the red and ground wire, you should have 12 volts. Across the yellow and ground wire you should see 10 to 12 volts it should also vary. This will tell you that all DC voltages and the seatalk voltages are OK. I would next secure power to the antenna, leave it off a couple minutes and then try it again. If these suggestions do not help you may need to replace the 120 GPS. The new RS125 is the replacement for this unit.
Posted on Sep 22, 2008
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Posted on Jan 02, 2017
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