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Re: Pertronix install.....zap

To: "Barney Gaylord" <>
Subject: Re: Pertronix install.....zap
From: "Tim Economu" <>
Date: Wed, 11 Sep 2002 11:48:04 -0700
Yep, that is the consensus also from other who have also reversed polarity.
Having done electronic design for the past 30 years, including using Hall
effect switches, I am surprised that they use no internal polarity
protection. It is a simple thing to do, merely requires a simple 5 cent
transistor since the coil current is low.

But like you I have learned the lesson!! Now I know why all the
MG pros carry the spare points in the toolbox!!

Kind regards,


+++++++++ contact info ++++++++

Tim Economu
Senior Design Engineer
Offgrid Engineering LLC
4131 Springwater Rd.
Clinton, WA 98236 USA
phone:  360-579-2117


----- Original Message -----
From: "Barney Gaylord" <>
To: "Tim Economu" <>; "MG List" <>
Sent: Wednesday, September 11, 2002 11:21 AM
Subject: Re: Pertronix install.....zap

> At 11:32 PM 9/10/02 -0700, Tim Economu wrote:
> >.... installing the Ignitor in my 25D distributor, and .... After
> >determining there was no voltage getting to the coil, .... I found I had
> >reversed the coil wires. After correcting the reversed wires, I cannot
> >the Ignitor to switch, ....
> >
> >So my obvious question is, did I fry the unit, or ....
> Yeah, it's fried.  They don't seem to hold up well to reverse polarity.  I
> was recently called to the aid of an ailing MGA that had a new battery
> momentarily installed backwards.  After correcting the battery polarity
> Pertronics unit was a dead short to ground and proceeded to smoke the
> ignition supply wires when the key was switched on.
> Some of our best lessons in life are learned the hard way.
> Barney Gaylord
> 1958 MGA with an attitude

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