The 2 PO’s of my boat had it on the Sea of Cortez for a number of years. So I have all double of everything on the boat. Pictures attached are the voltage regulator ( replaced with the spare) and the “emergency backup” the small one . My alternator also has the built on regulator.
Thanks everyone for the great response and suggestions. After completing a bunch other projects I got back to the crazy gauges and found the voltage regulator had gone bad. Fortunately the boat came with a ton (literally) of spare parts. One of which was a voltage regulator. Alls well on the gauges.
I have weird gauge problem. My gauge panel shorted and almost set the boat on fire. Rewired everything install new temp gauge and sender, both had died a few weeks ago. My problem is every thing works fine until I get to 1400 rpm temp and fuel gauge peg high and tach acts weird. Can’t figure it...