Quote:
Originally Posted by WNDSRFR
Why is everyone here talking about voltage? The problem is current. A car battery can have 13 volts but hardly any current. That's why batteries are load tested not voltage tested. In a firehose analogy voltage is the water pressure. Current is the water volume.
The engine takes a lot of volume to turn over where lights take very little.
Ohm's law: E=I x R. Voltage is E, Cuurent is I and Resistance is R.
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Yes current is a great check but current will be the same throughout the entire circuit. Voltage is what will vary depended on where your issue is. If you battery is bad with high internal resistance when you put a load on the system the battery voltage will drop. If your relay, fuse or wire is bad the voltage will drop after the issue not at the battery.