It just means that something was "on" and drawing current. The testlight
just completed the circuit (just like the battery cable did before you
disconnected it). With everything "off" (i.e. nothing pulling current,
like maybe a clock - in the radio, microwave, GPS etc., or the radio,
DVD/VCR, or anything else), you should not light the test light. If the
light still lights with nothing on, then you have a short (i.e. positive
lead connection to ground) not a 'negative charge'.

Keith

ANDY PHILLEY wrote:
I have a 2002 Smokercraft. I was doing some testing for my
downriggers and I noticed I have a negative flow through my boat. Is
this normal? I found this by un-hooking my negative lead from the
battery. I then hooked a test light between the post and the hull and
it lit up. Do I have a problem?