duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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Welcome to the Org.
Check your and clean your battery cables, check and clean the connections on the alternator, have the alternator tested, as well as the batteries. You may have a battery that is bad. Being your have 2 batteries this is not really a problem. But once it gets cold it will be a big problem. Or you have a something draining the batteries. Also it could be a faulty voltage sensor or regulator.
To clean the battery cables get some baking soda, wire brush, safety glass, and rubber gloves. Remove the battery cables from the batteries, take the wire brush to the terminals on the battery and the cables. Then pour some water on the battery terminals and sprinkle baking soda on them. The baking soda will neutralize the acid. Do this to all the battery terminals and cables. Then put some electric grease on the terminals to prevent the corrission. To clean the connections on the alternator just use the wire brush. Then while using a voltmeter check the voltage coming from the alternator, while the engine is running it should be 14 volts. Then check the voltage while cranking should be 13 volts with no load, and should drop no lower then 11volts while cranking.
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Your Actions Today, Decide Your Future Tomorrow
2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt