Battery Load Test
Battery Terminal Corrosion
Headlights "ON" Step 3 - Next, crank the engine over while observing the headlight brightness, they should only dim slightly when using the starter, if they dim way down, or go out followed by a machine gun style of clicking noise, the battery can not supply the voltage needed to operate correctly and must be replaced.
Headlights Dim Helpful Information As a battery ages it loses the ability to store electrical energy resulting in an insufficient flow to the starter. When a starter is subjected to low voltage/amperage (flow) it will cause the starter to engage and disengage rapidly producing the machine gun like sound. A battery will not perform as it should if the alternator has failed, or the battery has failed internally and replacement is required. Visit - Alternator testing Visit - Battery replacement When a battery short circuits internally, the case sides can bulge indicating warped plates which short circuit causing the engine to stall due to a drop in system voltage. Battery acid and electrolysis can cause corrosion inside the battery cables which will inhibit the electrical flow, look for bulges near the top of the cable, these bulges indicate corrosion expansion caused by the chemical reaction between the acid and copper wire and must be replaced. A regular battery must have a "rest" or "down" time to allow the plates inside time to cool. A battery subjected to constant charge and complete discharge will fail prematurely unless its a "deep cycle" type. A battery is hazardous material and must be disposed of at a local parts store or recycle center. Common Problems
- Battery fails due to age or internal defect
- Battery cables become loose, causing the electrical system to fail and the engine to stall