Come on here guys&gt; If you do not have a decent voltmeter, BUY one. $25.00 will do one that will serve the purpose. Start checking for voltage drops from the battery down to the starter and then even from the starter to ground. I am sure you are loosing some voltage at each connection. Now you need to find how much so you can the voltage drop down toacceptable limits. More questions, send me a PM.