REFLECTOR: Bus, Battery & Electrical Instrumentation

[Jim Sower]

Ooops - forgot my other question:  Does it matter if I measure right at 
the B+ post on the alternator or at the Alt Relay on the firewall near 
the battery?  I would think not, but then, closer to the battery might 
damp out some of the ripple.  I don't know ... Jim S.

Wayne wrote:

>> Does anyone know of a simple way to detect out of bounds Alt ripple? 
>> ... Jim S.
>>
> Now that you have reminded me  I used this technique for a quick and 
> dirty power supply check on the equipment I used to troubleshoot.
>
> measure the output voltage of the alternator with a decent digital 
> meter set to AC volts. The ripple should be  fairly low. The DC 
> component will be ignored by the meter due to the AC coupling to the 
> meter.
>
> Record in your logbook the value when your system was new and in good 
> operating order under various load conditions. You should have a good 
> clue because the ripple will jump up several hundred millivolts  (for 
> a 12 volt system)  when a diode craps out.
>
> Wayne
>
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