Hummingbird 580 not turning on

[YakDout]

Originally Posted by supaboy1981

Getting 12.47 on the voltmeter same at the terminal connectors and the at the head unit power attachment .9. There is a 2 fuse on the power line. So the unit has power. I'm guessing it's just the head unit. I tried to take it apart to see inside but I don't have a hex bolt that size and it's stripped just enough so my Allen doesn't turn it. Anybody have a lead on a compatible head unit?

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Sounds like you are losing power in the wiring somewhere. Wires corroded? Good connections. Someone correct me if I am wrong but the .9 volts you are getting at the head unit should be close to the same as at the battery, no?