I've had an intermittent starting / charging problem with my Hummer. I think my starter's also going out also, slow to crank even when fully charged batteries. I put my parallel batteries on a charger last night. I just tried starting the rig after I took off the charger. The positive side the battery I had the charger on started to smoke and sizzle. Of course, rig still won't start but then I stopped as it started to smoke and sizzle. Don't want a fire..
What does this mean? over charged that battery? Batteries were installed in 2009.