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richardmorris
Firing on two.
Joined: July 9th, 2009, 10:27 am
Posts: 493
Location: Bagshot Park
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 Re: voltage regulating knightley wrote: richardmorris wrote: knightley wrote: Isn't 15.2 volts a little on the high side? I thought about 14.7 max. How accurate is your voltmeter? Had it calibrated? Not calibrated John, I thought it a touch high but both my electronic regulators are giving identical readings. And they're stable to 2DP and not fluctuating. Could it be the battery? It was showing 12.8 before starting the car. If both are giving the same reading maybe it is your meter over reading. Have you got access to another one to confirm? Not just at the moment; my Dad's got one, but it's 200miles away 
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| March 28th, 2014, 11:34 am |
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Luke
Firing on two.
Joined: December 9th, 2008, 7:50 pm
Posts: 662
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Re: voltage regulating My suspicion would be that both your electronic regulators are fine (and your meter, to be honest!) but, as Joolz suggested above, the wiring 'twixt the regulator and the battery is dropping some volts. The regulator measures the voltage it sees between its earth pin and the connection to the battery (via the ignition switch and the - probably grubby - fusebox), and alters its output (to the alternator field) until it 'sees' 14.4V. If there's some resistance between the battery and the regulator, the output to the alternator will be higher to compensate.
I'd suspect either the earth connection the regulator, or a dirty fuse. You could try connecting it straight to the battery as a test, and see what voltage you get then? One wire to battery -ve, one to battery +ve, and the other to the alternator. Not sure which connector is which offhand, I'm afraid, but I'm sure you can work it out!
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| March 28th, 2014, 11:47 am |
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richardmorris
Firing on two.
Joined: July 9th, 2009, 10:27 am
Posts: 493
Location: Bagshot Park
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Re: voltage regulating Luke wrote: My suspicion would be that both your electronic regulators are fine (and your meter, to be honest!) but, as Joolz suggested above, the wiring 'twixt the regulator and the battery is dropping some volts. The regulator measures the voltage it sees between its earth pin and the connection to the battery (via the ignition switch and the - probably grubby - fusebox), and alters its output (to the alternator field) until it 'sees' 14.4V. If there's some resistance between the battery and the regulator, the output to the alternator will be higher to compensate.
I'd suspect either the earth connection the regulator, or a dirty fuse. You could try connecting it straight to the battery as a test, and see what voltage you get then? One wire to battery -ve, one to battery +ve, and the other to the alternator. Not sure which connector is which offhand, I'm afraid, but I'm sure you can work it out! Found a poor connection between the headlamp switch and the lights-on buzzer circuit that was fitted (taken out now). Seems a lot better and voltage shows about 14.8 max now.
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| March 30th, 2014, 12:03 pm |
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