[Shop-talk] electrical problem with truck

[DAVID MASSEY]

Alternators, and generators, have what is called residual magnetism.  The steel laminates in the field (the rotor in the case of an alternator) will become magnetized.  As the rotor spins the rotating magnets will generate current in the stator coils.  This is important since power for the exciter field comes from the alternator output.  Basically it lifts itself up by the bootstraps. 
The amount of residual magnetic field  strength is small so it takes more speed to achieve enough voltage to start exciting the field will take more speed than that required during normal operation.  My TR6 alternator has a charge indicator light connected between the exciter power and the battery.   This provides a small amount of current to the exciter to help get things going more quickly.  The TR6 alternator will reliably start charging at or below 1,000 RPM with the light installed but if I reomove the light it sometimes needs 1,800 RPM.  
BTW, alternators are not direction sensitive since the rectification is accomplished wit semiconductor diodes.
It appears your new regulator is of a newer generation that actvates the IGN light directly. 
Oh, and three very good reasons for selecting that alternator. 

Dave 
 
  On Thu, Aug 12, 2021 at 17:02, Jack Brooks<JIBrooks at live.com> wrote:   _______________________________________________

Shop-talk at autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation  $12.96
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

Unsubscribe/Manage: http://autox.team.net/mailman/options/shop-talk/dave1massey@cs.com

  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/shop-talk/attachments/20210813/32758e43/attachment-0001.htm>