tomsboat
Senior Member
i have Airman thru hull depth finder that came with my 2007 Mainship trawler.it is hooked into a Garmin GPS map 4200 chart plotter.The other day my depth gage stop working.I looked up how to get it to work. I removed the cover and put 2.4 fluid oz of propylene glycol in the base put the transducer cover back on making sure it was level and screwed it down.The depth gage worked after that but once I turned it off and then back on it stop showing the depth.i did this 1/2 dozen times with the same results. Any Idea what I'm doing wrong?Tom