Question about Simrad AP35 GPS Receiver

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Simrad Autopilot won't turn on

Hello,
I used to have an AP20. It corroded out and so I replaced it with an AP35, which was suggested by a guy at Navico/Simrad. The junction box is the JX300-40 (I sent this to Navico and they tested it. They said it was fine.). However, the thing still doesn't turn on. I have been going through all the connections, of course. The main power supply shows full power going in (12 + volts) but the pink/grey output power source at the junction box shows (-2.5 volts). The Navico/Simrad guy said it should be 24 volts or so. He hasn't been helpful since agreeing to test the junction box. Would anyone be able to hazard a guess as to how this is happening?
Thanks,
Mike
Yokohama, Japan

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Try and turn on the unit at the J300-40 pcb by using a test light one end to gnd and going to the ap35 interconnect and touch the test light to each pin or until you hear the unit start up.

Posted on Feb 10, 2009

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