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11th July 2019, 15:37 | #1 |
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Rover 75 Connoisseur 1999 LHD Dealer launch car 100532 Join Date: Jan 2008
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V6 alternator charging volts
When driving the voltages are between 13,9-14,3 on econ, but with air con on, it is 13,8-14,0.
In idle, like in traffic lights, voltage drops 11,2-12,4 with air con on. New alternator time? |
11th July 2019, 16:41 | #2 |
Precise
Rover 75 Tourer 2.5KV6 Connoisseur SE Join Date: Mar 2013
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Voltages do not seem unreasonable to me. Output voltage depends upon state of charge of battery and the loads being applied at the time. At idle will be the lowest output anyway.
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11th July 2019, 19:16 | #3 | ||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
Quote:
What do you think Colvert? Simon
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11th July 2019, 19:19 | #4 |
MG ZT Join Date: Jan 2011
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I remember talking to Terry Shaw about V6 alternators and how many he'd ever changed, anyone want to volunteer a guess ??
I would check the battery terminals are tight first of all Brian |
11th July 2019, 19:49 | #5 |
Been absent for a while…
Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007
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Can’t say how many has Terry fitted but I’ve fitted absolutely.... none over the years
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11th July 2019, 20:31 | #6 |
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11th July 2019, 23:49 | #7 |
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I've never been asked for one either, but that voltage while at idle is quite low.
That said, with the amount of load placed on the electrical system by the large radiator fan running continuously with the A/C and the internal blower system (along with everything else) it's possible the alternator just can't keep up with demand at the relatively low rotational speed of running at idle.
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12th July 2019, 05:34 | #8 |
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I would not worry. The charging sounds fine.
I have replaced an alternator on one 75 however. Didn't charge at all and got stinking hot.
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