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Voltage opinions?

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Old Jan 29, 2011 | 02:31 PM
  #1  
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martysmartie
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Default Voltage opinions?

Hi,

I currently get 13.24V at idle with NO load, I get 13.30V at the alternator itself, however when I turn on blower, heated rear screen and headlights I get 12.75V at battery and 13V at alternator, so my question is what is everyones output at idle?

With that little difference I don't suspect the battery to alt cable being the problem.

13.30V to me seems a little low considering thats with no load, the alternator was tested a couple of years ago and and they said it was fine, they did replace the voltage regulator for me though as the other one was a little loose, so my question is what is everyones output?

The voltage does not increase with revs either.

Any help would be appreciated.

Martin
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Old Jan 29, 2011 | 03:05 PM
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Nothing wrong with those figures, the voltage won't always increase with speed, more so when the amps are being gobbled up, I always say so long as 12.8 maintained at 2000rpm with everything on then it's fine.
Mine was no load 13.3-13.4, and dropped to around 12.6@idle with loads, reaching 12.9@2000rpm.
tabetha
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Old Jan 29, 2011 | 03:06 PM
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From: devon
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mines pretty much the same as yours and ive got a new wire from the alt to battery encase and is still the same.. thats reasing from the secs monitor
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Old Jan 29, 2011 | 03:14 PM
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Thanks for that guys, at least I know I am "Normal" now LOL.

Martin
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Old Jan 29, 2011 | 11:48 PM
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From: preston
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anyone else have to blip the throttle on starting to get battery light to go out?
my readings are similar to yours but i maintain just over 13 volts at idle with load
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Old Jan 30, 2011 | 10:51 AM
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Never have to rev it, I should think thats a lazy diode thats the problem, does your idle ok when you startup? I used heated rear screen, heater on pos 2 and headlights to put under load if I turn heated screen off then it's around 13V so same as you.

Martin
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Old Jan 30, 2011 | 06:11 PM
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From: preston
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no i have to rev it for a minute to keep it going, i had a fault with the tps settings thought id sussed it as i found ive got 4x4 ecu and 2wd wiring so swopped the wires round on tps and my coldstart and iscv started working again, then i came to it next morning and have no coldstart but appear to have idle correction once running for a few minutes! bloody cossys
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