Hello,

 

Bought a used 8100NEX off ebay. Didn't come with any cables but got a decent deal so couldn't complain. I installed it and works beautifully, until my antenna came in the mail and hooked it up. Second I installed it a message came up saying GPS Antenna problem detected. According to the manual it is a short circuit. So, is there anyway to confirm the short circuit with a DMM or something? Just don't want to waste time returning and shipping out another antenna if the head unit is the problem. Any help would be appreciated