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Battery test?

Testing battery off car after a 48hr trickle charge tests with digital display multimeter set to 20 dc the reading was -12.83.

Curious to know why it shows as minus I would expect it to show numbers without the - sign.
Thank you in anticipation.

bob
February 2013
Luck it wasent your battry charger leads round wrong way,that would be nasty mistake,

Steven,s,
February 2013
Luck it wasent your battry charger leads round wrong way,that would be nasty mistake,

Steven,s,
February 2013
Thanks!

Yep both right! wasn't concentrating when replacing damaged leads which sockets they were in thought I put them in the right ones but hadn't.

Only use it for low voltage or testing fuses cables ffor breaks. I respect mains and leave that to those who know.

Bob
February 2013
It read as a minus because you had the positive lead on the neg terminal and the neg lead on the pos terminal.
Handy to know next time your tracing 240v cables where lighting switchwires are red/black (or brown/blue) instead of red/red (or brown/brown)

GB in Wales
February 2013
are test leads on correct way,and plugged into correct sockets in multi meter?

k
February 2013
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