For years, I had to keep up monthly charging to my trucks & generators to make sure they will always start. Last month, I checked the solarizer that came on the Deuce & it was no longer working as the ledge on the mobile shop was covering the solar cell from direct sunlight. After changing the wires & location of the array, the solar cell proved to have gone bad.
Since I had a few new solarizers in the boxes, I replace the one on the Deuce & added a new one on the M-1081 LMTV. The defective one that was originally on the Deuce, got a solar cell array of its own from an old solar light that had ceased to function & was installed on the newest Deuce. All this work eliminated the battery problems on all three trucks & shows 25.4v on all battery's when checked.
Floridanson gave me a solarizer that a rat ate the wires off of & I replaced the wires & solar cell & attached it to a spare generator 24v battery to keep it hot if needed. The last units I bought were cheap, & the best prices now are $100.00 & according to the company, they are no longer made.