<VV> Electrical curiosity

Hugo Miller hugo at aruncoaches.co.uk
Mon Dec 30 18:15:49 EST 2019

Might be worth trying another car & see if you get a similar reading?

On 2019-12-30 18:36, Frank DuVal via VirtualVairs wrote:
> But the positive terminal of the coil should never be zero volts.
> With points closed it is 9 or so. And points open is 12 or more 
> volts.
> So it varies between 9 and 14 ish running. Then there is the 
> inductive
> kick of the coil that throws that off and the noise susceptibility of
> a digital meter and all bets are off to a good reading.
> Frank DuVal
>> On Dec 30, 2019, at 8:12 AM, Hugo Miller via VirtualVairs 
>> <virtualvairs at corvair.org> wrote:
>> To expand on my previous post - the voltage will be bouncing around 
>> very rapidly between 9 volts and zero as  the points open and shut. 
>> That's going to throw any volt-meter into a state of confusion!
>>> On 2019-12-30 13:08, Frank DuVal via VirtualVairs wrote:
>>> Was the meter on the coil a DVM?  If so, the leads were picking up
>>> the high voltage impulses from the HV side of the coil. Electrical
>>> noise.
>>> Frank DuVal
>>>>> On Dec 30, 2019, at 4:00 AM, Smitty via VirtualVairs 
>>>>> <virtualvairs at corvair.org> wrote:
>>>> While working on another issue I came across a situation I can 
>>>> not believe possible.  Car is a 62 with an alternator conversion 
>>>> complete with Late regulator.  In my troubleshooting for the other 
>>>> problem I had two volt meters clipped into the system .  One across 
>>>> the battery terminals and one from ground to the positive terminal 
>>>> of the coil.  This of course was reading through the resistance wire 
>>>> which would normally be showing around 9 volts in the RUN condition. 
>>>> The battery meter was showing a rock solid 14.2 volts.  The one at 
>>>> the coil though was flashing all over the place showing voltages as 
>>>> high as 19 volts and as low as 8 or 9 volts.  I find it hard to 
>>>> believe that this is normal.  So what gives here?
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