[Healeys] *** SPAM ***Re: Timing light query (OOPS)

David Nock healeydoc at gmail.com
Tue Mar 12 09:39:29 MDT 2019

If your car is Positive ground the timing light will not work. If you are 
positive ground you will need to use another battery to power the timing 

David Nock
healeydoc at sbcglobal.net
209 948 8767

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-----Original Message----- 
From: sentenac.rw at gmail.com
Sent: Monday, March 11, 2019 10:13 PM
To: Michael Oritt
Cc: Healeys
Subject: Re: [Healeys] *** SPAM ***Re: Timing light query (OOPS)

The problems I was mentioning only happen if you use the car's
batteries for a supply to the light.  If you use an independent
battery and don't somehow link one side of the supply battery to the
car's chassis you shouldn't have a problem.

On Mon, 11 Mar 2019 22:07:19 -0700, you wrote:

>Polarity also matters in a different way if your timing light has a
>metal case  and one of the power leads is grounded to the case, as
>mine is.  If you use a 'regular' timing light designed for negative
>grounds in a Healey with a positive ground system, and if you then
>touch the case to the chassis or engine you will get a lot of sparks
>at a minimum, and maybe do some welding where you had not intended to.
>BN1 #724
>On Mon, 11 Mar 2019 21:32:53 -0400, Michael Oritt wrote:
>>The 12VDC lead does not need to go to the battery, merely a source of 
>>whether or not it is part of your car's electrical system.  I don't know
>>how your engine is configured but you can take power off of the starter
>>solenoid, coil hot lead, etc. etc.  Polarity does matter, however.
>>Best--Michael Oritt
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