I have driven a daily driver FI Bus since 93 and have always charged it with the battery connected AND jump started it, which is a no no according to the Late John Muir. I have never had a problem.Maybe I'm just lucky. I am in no way stating I am a VW mechanic but I did stay in a Westfalia the other night... --- On Sun, 6/5/11, David Schwarze <dschwarze@xxxxxxxxxx> wrote: From: David Schwarze <dschwarze@xxxxxxxxxx> Subject: [tcb] Re: Battery Charging With Fuel Injection To: tcb@xxxxxxxxxxxxx Date: Sunday, June 5, 2011, 2:42 PM I don't want to guarantee that a solar charger will not damage your computer, but if it were my bus I would have absolutely no qualms about it, even if it were a higher-power charger. I have charged many batteries while installed in vehicles with computers and have never had a problem. -David On 6/5/2011 12:06 PM, kelly dosch wrote: It says in my manual to disconnect the battery before charging or it will fry the Fuel Injection computer or something. Does anybody know if that would be true even with a tiny solar trickle charger?