So I notice Garmin has a Vehicle Power Cable (12v lighter socket) for the Echomap and Striker series - but the 126SV is not listed under compatable devices... in fact I don't see any 10 or 12" units listed. Is there a different version for the larger Garmin units? They are all 4pin so don't know why this would would not work?
https://www.garmin.com/en-US/p/667581#overview