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A and B series mowers

Battery testing

To load test a battery:

1. Fully charge the battery (24 hour charge).

2. Move the mower to a safe area.

3. Take the cover off of the battery box.

See Figure 6.3.

4. Disconnect the spark plug wire.

NOTE: Do not remove the spark plug.

5. Attach a digital multi-meter (DMM) to the battery

posts. See Figure 6.4.

6. Set the DMM to the volts DC scale.

7. Attach an inductive amp meter (amp clamp) to the

negative battery wire.

NOTE: If you have a negative measurement, the

meter was connected backwards. Just

ignore the minus sign.

8. Turn the ignition key to crank the engine for 10 sec-

onds.

NOTE: While the engine is cranking, read the volt-

age on the DMM and the current draw on the

amp clamp.

NOTE: DO not crank the engine for more than 30

seconds at a time.

9. If the battery voltage drops below 7.5 volts and the

current draw is less than 110% of the starters rated

current draw (from the engine manufacturer)

, the

battery is bad.

NOTE: If the current draw is more than 110% of the

starters rated current draw, there is either a

short in the system or the starter is pulling

too much current.

Figure 6.3

Battery box

Figure 6.4

Amp clamp

DMM

Figure 6.5

MTD "A" Series User Manual

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