 How much AC is normal in a charging circuit? |
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| ArtechnikA |
 Aug 3 2011, 07:54 AM
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rich herzog  Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None  |
Replaced a shorted-cell battery in a friend's truck yesterday and went looking for reasons why it might have failed (other than the usual team of Age and Heat).
Charging circuit was putting out a nominal 13.6VDC but also 30VAC (p-p, so roughly 20rms). This seems a lot but I checked 3 other vehicles and they _all_ had ~30VAC ripple - so I have to gather that's "normal". Is it? I've never seen a spec for AC ripple. I know that diodes either short (bad scene - coil wires remain energized...) or open - causing lots of ripple - but what's 'normal' ? |
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| underthetire |
Aug 3 2011, 08:26 AM
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
I havn't seen a spec either, but being there are no CAPS in the charging circuit, (other than the battery sort of) i would guess that to be normal. I do know Chrysler does kinda bump charge, using an AC spike to keep the battery from sulfating.
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