[Shop-talk] Alternator terminals

[Dave Cavanaugh]

Thanks; I'll give that a try.

We tried just connecting to the B and ground terminals with a meter and 
could never get higher than 5 VDC no matter how hard we pedaled and when 
I put a 12 volt lamp in the circuit it didn't even start to glow.

On 4/14/2016 2:18 AM, Randall wrote:
>> If you look a this chart,
>>
>>
>>
>> 	http://dasko.co.nz/articles/alternator-terminals-explained
>>
>>
>> It looks like all I would need to hook up to would be the "B"
>> terminal and the ground and I can ignore the rest.
>>
>> Do I have this right?
> You can try that, but I suspect the Ex terminal needs to get current through the warning lamp (which provides excitation when the
> alternator first starts turning), and the S terminal needs to get battery voltage (The 'sense' input to the voltage regulator).  You
> can use a resistor instead of the lamp, if you want, but you'll still need an external source of 12v to get it working (and a switch
> to stop it from drawing current all the time).  Just jumper the S terminal to the B terminal, though.
>
>> On an automotive alternator how fast does it normally have to
>> spin to put out 12V?
> They'll usually put out something with the engine idling, maybe 1000-1200 rpm at the alternator.  Full output requires more, though,
> generally something like 5000-7000 at the alternator.
>
> Randall
>
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