BFL13 wrote:
AFAIK ? You need a current to get a voltage drop. Seems like there must be a big current to get that big of a drop? Short? I still suspect the wiring from installing the new battery. If one of them is shorting (somewhat, but not completely if that is possible) could that do it?
well, to get a voltage drop you need current AND resistance. you can get big voltage drop with lots of current and very low resitance or very little current and lots of resistance.
for a DC circuit, V=I*R. (actually for AC as well but I, V and R are vectors, not scalars, so the math can be much more complicated)
