[NJARC] Fw: Ampmeter on 1935 Harley Davidson

[Jim Whartenby]

Consider that batteries then were 6 volts.  At 40 degrees F, a battery with a 
10% charge has a terminal voltage of 5 volts and with a 100% charge, 8 volts. 
 You have a three volt swing between these two extremes or half of the battery's 
rated voltage.  The charge regulators then were mechanical and controlled the 
current to the generator field winding in an ON / OFF fashion.  So I would guess 
that a voltmeter pointer would be all over the place as the regulator relay 
contacts opened and closed trying to maintain the battery's charge.


At least with an ammeter you could tell if the battery was  charging or 
discharging.  Perhaps not perfect but better then having a voltmeter pointer 
swinging all over the place.
Jim



________________________________
From: Karin Dowgin <kdowgin at comcast.net>
To: "njarc at mailman.qth.net" <njarc at mailman.qth.net>
Sent: Tue, March 12, 2013 3:50:48 PM
Subject: [NJARC] Ampmeter on 1935 Harley Davidson

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_________________________________________________________
Greetings

Does anyone know why a 1935 Harley Davidson Motorcycle would have a ampmeter 
mounted on the top of the gas tank rather than a voltmeter?

Jerry Dowgin

Sent from Jerry's IPAD !

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