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<p>[QUOTE=&quot;Ross_Tech, post: 11676832, member: 322438&quot;]Check the voltage drop from the batteries to the starter while you have someone crank it. Positive and ground side. Conventional diagnostics says that anything over .5 volts is excessive, but with an x15 I would say from experience anything over 1 volt is excessive on the positive side, and .5 volts on the ground side.&nbsp; If it is high, you have resistance somewhere in the main battery cables. Also, unless you load tested the batteries, they may still be bad. And weak batteries can ruin a new starter.[/QUOTE]</p><p><br /></p>

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