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13th July 2019, 17:02 | #1 |
Posted a thing or two
Jaguar Xe diseasal Join Date: Nov 2011
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Voltage of battery when charging?
Hi, does anyone know what the voltage reading across the terminals of the battery should be while the engine is running at idle, and when held around 2000rpm?
My bike used to be 13.5 at idle and 14.3 and above when held at 2000rpm. But the car was reading 14.3 at idle and only went up to 14.6 at 2000rpm. |
13th July 2019, 17:07 | #2 |
I really should get out more.......
Rover 75 connoisseur se v6 auto Join Date: May 2014
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i think at idle 14.8 and resting 12.7 or 8.
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She came off the Longbridge Line on 20-05-2003 The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide. |
13th July 2019, 17:55 | #3 | |
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Rover 75CDT, Jaguar XF-S 3.0V6, V'xhall Omega V6 Estate, Twintop 1.8VVT, Astra Estate and Corsa 1.2 Join Date: Dec 2007
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Quote:
Bikes used to produce somewhat low voltage at idle hence the change in headlamp brightness when you revved them up. These days, cars and bikes are calibrated to charge the battery even at idle given the amount of electronics that act as loads even at idle. As long as the voltage is between 13.7 and 14.7 with the engine running, there should be nothing to worry about. |
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13th July 2019, 19:19 | #4 |
Posted a thing or two
Jaguar Xe diseasal Join Date: Nov 2011
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Ok thanks, I was expecting a bit of a jump at higher revs like on the buell, so was wondering if the dead battery was due to a failing alternator, but hoped not at that was new last year.
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13th July 2019, 20:57 | #5 | |
This is my second home
75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010
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Quote:
Try putting plenty of load on the alternator, then measure the voltage - headlights on, heater fan full speed, fog lights etc..
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Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money. |
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