One of my external battery packs stopped working with my Promark 2. I have 2 with the same setup. I repaired wire connection on both a few years ago. So when this one stopped working I first thought it was the wire connection. Cut the heat swrink tape off, re-did the connection. Looked good thou. Had to reapply the heat swrink tape again. Got the ole multimeter out. Negitive wire to the cradle was fine. Continuity to the possitive side was no go. I popped the case open on the voltige regulator, and something fell out. I have no idea what it is. All I know is it's round, and it use tobe on the circuit board. The regulator is toast as far as I'm concerned. I need a new inline voltage regulator. Knowing you are a Magellan Ashtech Guru I need your advice. Will any of these work? Or do you have a better choice.
HOSSEN® DC/DC Converter 12V Step Down to 3.3V 3A Power Supply Module, Non-isolated
Autek DC to DC Buck Converter 12V to 3.3V 3A 10W Step Down Car Power Supply Module(DCCON-C3.3)
DROK 12V to 3.3V 3A 10W DCDC Buck Power Converter Low Voltage Regulator Waterproof
SMAKN Dc/dc Converter 12v Step Down to 3.3v 3a Power Supply Module
I'm pushing 4 D cells = 6 volts imput.
Thank You,
Jules J.