Dynamator Wiring

Associated with Alternators

In late 2018 there was a substantial thread on the UK MG TD/TF BBS about problems that a TD owner, Mort Resnicoff, was having with a Dynamator obtained from Accuspark.  Seems that there were two installation issues that showed up - one is that his car is wired as a positive ground system, where that's unusual for alternators, secondly is that the supplier's wiring diagram does not show how to wire the car's ammeter into the circuit.  The Dynamator has no need for the car's voltage regulator, it is internally regulated.  It took Mort a good while to come up with a wiring diagram that should solve the problems.  But, that's when it became obvious that there was a fault in the Dynamator.  It was causing a significant drain on the battery when connected into the car's electrical system, about 4 amps. Accuspark acknowledged Mort's test results and very promptly replaced the Dynamator for Mort.  It is now functioning very well with Mort's wiring shown below.

This wiring diagram is for use in the installation of a Dynamator in a Tcar wired for positive ground and an ammeter.  The relay that is shown in the wiring diagram is provided by Accuspark for use in positive ground systems. The wiring diagram is shown with the permission of Mort Resnicoff.

Mort Wiring


Mort was allowed to keep the faulty Dynamator, rather than ship it back to the U.K. This was the perfect opportunity for Mort and a fellow enthusiast, Jim Northrup, to have a look inside of the faulty unit and see what makes it tick.

  Jim Northrup is noted for being knowledgeable about things of this sort and might be summed up as ..."a Journeyman Steamfitter, Welder & Welding Engineer.  In college, we studied transformers and DC generators that ruled the welding world, before alternators, power transistors and inverters entered the picture.  Welding generators and transformers were pretty darn amazing for their time.  I even took a college course on steam engines.  Does that date me?  I jumped from nuclear power plants into robots and home computers when they first became popular almost 4 decades ago.  A quarter century ago, I procured a hydraulics shop and have been playing with heavy equipment, vehicles, robots and wife's MGs ever since."

 Mort and I have been learning much from Jim.  For a look at Jim's discoveries see DynamatorInnards.