The Stovebolt Site Forums The Shop Area Engine Shop 6 volt slow cranker 1954/ 235 /Chevy/Three on the tree

Measure the voltage drop in each cable. For the hot side, use a meter directly from the PLUS post to the post on the starter.

For the "ground" side, scratch the paint off a bit of the
actual starter itself, and measure from there to the MINUS
post.

LBNL, measure + to - post on the battery while cranking.

You're gonna need a helper for all this.

Then compare. Whichever side of the wiring has the larger voltage drop is where the problem is.

Cheers!
George