The Voltage in the circuit should normally not exceed 14,7V. If the
alternator produces 80+V this should be reduced by a regulator to the
said 14,7V max. Most alternators have an internal regulator meaning the
these alternators will not produce more than the said 14,7V. In the
later cars the electrical gauges (fuel, temperature) are supplied with
10V from the small Voltage regular somewhere behind the dash, usually
fixed on one of the large instruments. The other instruments are the
said voltage meter and the mechanical oil pressure gauge. The oil
pressure and temperature gauge can be combined in a dual gauge in which
case both gauges are mechanical and do not need a power supply so cannot
be overloaded with 22-24V.
Kees Oudesluijs
Op 22-12-2020 om 20:35 schreef R. Lindsay:
> My voltmeter stopped working yesterday.
>
> I have done some checking and it looks like all my gauges are taking 22 - 24
> volts. The alternator is producing 80+ volts while the battery is at 14.5
> volts with the engine running and 12.5 with it off.
>
> Does this sound normal? Is there some kind of resistor in the gauges to step
> down the voltage? Could it be a diode?
>
> Thank you for any help?
>
> Price Lindsay
>
> Cell: 630-841-6300
> Email: 050.rpl@gmail.com
>
> Sent from my iPhone
>
>> On Dec 21, 2020, at 4:16 PM, Kees Oudesluijs <coudesluijs@chello.nl> wrote:
>>
>> Hello Price,
>>
>>
>> The Voltmeter is the least of your worries. If the output of the
>> alternator/generator/regulator is showing 22-26V something is amiss. This
>> should be rectified first!
>>
>> I am not sure if 26V would kill the Voltmeter. If so, repair is not really
>> on the cards I think. The coil type (early ones) is harder to find I think,
>> the later ones are still available new and there are plenty available used
>> on eBay. If you have a picture of the meter I may have a look at my
>> collection of gauges. Problem is shipping costs though.
>>
>>
>> Cheers,
>>
>> Kees Oudesluijs
>>
>>
>>
>> Op 21-12-2020 om 21:25 schreef R. Lindsay:
>>> My voltmeter just stopped working. I have taken it out of the car and
>>> tested the wires to the unit. They show 22 - 26 volts to the voltmeter. I
>>> also tested the connection at the battery - 14.0 volts.
>>>
>>> I presume there is too much voltage to the volt meter but perfect to the
>>> battery. Could the voltage to the voltmeter have burned it out? Is there
>>> a way to fix the voltmeter?
>>>
>>> Thanks.
>>>
>>> Price Lindsay
>>>
>>> Sent from my iPad
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