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Check for b+ voltage at the starter. If the voltage at the starter is more than a few tenths less than what was read at the battery then you have excessive resistance in the power wire. Next measure the amperage draw during cranking. An excessive amperage draw will be the result of a problem with the starter itself or a mechanical issue with the engine. The latter issue can be ruled out by ensuring that the engine can be rotated by hand or by attempting to pop start. Another thing to be noted is a proper battery ground. Proper circuit design will utilize wire of the shortest length necessary and of a gauge that is thicker than the expected circuit amperage draw.
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