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HOW TO TEST A BATTERY - SHOP CLASS 101
The first step in testing starting charging systems is to understand the ACTUAL state of the battery. With that in mind I have attached a few easy steps to see what is going on.
Batteries have not changed that much over the years as far as the test procedures. They stay the same.
Visual Inspection
State of Charge
Open Circuit Voltage
Load Test
Equipment Required: A KNOWN GOOD Digital Volt Meter. (Cheap is OK)
Step one: Test battery at the top posts (yes, I know it is in the trunk under God knows what. That is life. See engineering/design for details. It beats the back seat).
Car off after 30 mins: What is the reading? 12.5V or higher? Under 12.0 volts?
For the next steps read the attached docs. It will make the guessing game go away.....
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
Last edited by StephenVA; 08-07-2015 at 08:12 AM.
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