Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Troubleshooting






Midtronics Battery Tester

Troubleshooting

Sometimes the display shows the malfunction or the messages based on the condition.

The following is a list of the most frequent displayed messages together with suggested solutions.

Refer to the MCR340V Operating Instructions for messages not listed here.






Wait a few minutes and then perform the test again. Refer to => [ Battery, Testing ]. Battery, Testing

If the test was performed at the battery jump start terminal and the message still does not go away, then perform the test directly on the battery.