Has had several batteries, won't stay charged.

Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. The only reasons that batteries will not stay charged are: 1) there is a parasitic draw that is causing the battery to run down when the vehicle is not operating. 2) the charging system is not sufficiently charging the battery after it is being used. And that's it. There's not much else here. Either somethings drawing the battery down without being asked for, or something isn't recharging the battery once it's been used. If something is drawing on the battery, you'll have to see if voltage is being drawn an amperage is being drawn after the vehicle is off. If the charging system isn't working, you should be able to measure alternator and voltage regulator output for amperage and voltage. Seek guidance from a shop near you if needed. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!