Re: Power Trim
They draw some considerable amps, so I'd expect some drop in cranking RPMs if the trim pump is running also. I'd guess up to 50 rpms. There could be a bad connection inside the battery. That you would be able to do nothing about. Sometimes there's some breakage inside the battery that will show great voltage, but internal problems prevent transferring a lot of amps right away. But Clams is probably right. It's taking a lot of amps to set-up a circuit due to loose or corroded battery connections (which could be internal to the battery).<br /><br />Make sure the battery connections are spotless. Put the wires with the heaviest draw on the post first and the least draw last. Crank the wingnuts with pliers. There are two reasons to put the wires on the posts in the right order. The best connection between the battery and cable is at the post and not thru the nut. The heaviest eyes are on the heaviest wires and conduct well to the small wire eyes, but all that electricity squeezing thru a light wire eye to the large one is pushing a lot of juice thru not much metal.<br /><br />One easy test with that multimeter is a voltage drop test. Put the switch on DC voltage and connect the wires straight to the battery. Then try various things and see what the needle does. It should drop a couple of volts running the trim motor. The starter will drop it more. You don't it to drop below 9 volts.
