18 volt Porter-Cable charger

Tom/Idaho · Feb 18, 2020

I have two 18 volt Porter-Cable battery chargers.
Both show -47 output voltage.
Why is that?
Thanks, Tom/Idaho

Steve@Advance · Feb 18, 2020

Do they still work?

If so, try checking the voltage with a battery in circuit. I suspect they need some load, some reference to regulate to.

If they don't work, could be bad batteries. Might try a known good battery. Same reason, if the battery is open, discharged below a certain voltage, or it senses something is wrong, it won't try to charge.

Power tool batteries and chargers are different than your typical lead acid battery charger, they do their own thing, beyond my reasoning!

Jack345 · Feb 18, 2020

Sounds like you are checking no load voltage.Its harder to check under load as battery will be in your way. If you check under load voltage will be above 20vdc.

Mule Meat · Feb 19, 2020

Reverse the leads on the tester and try again.

Tom/Idaho · Feb 19, 2020

Thanks for your responses,
Tom/Idaho

18 volt Porter-Cable charger

Tom/Idaho

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Steve@Advance

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Jack345

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Mule Meat

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Tom/Idaho

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