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.
-Roland
BN1 #724
On Mon, 11 Mar 2019 21:32:53 -0400, Michael Oritt wrote:
>Simon--
>
>The 12VDC lead does not need to go to the battery, merely a source of power
>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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