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</head><body>Why wouldn't it work on positive ground car? Just hook red to positive like the block and black to negative like the solenoid lug from the battery.<br><blockquote type="cite">On March 12, 2019 at 11:39 AM David Nock <<a href="mailto:healeydoc@gmail.com">healeydoc@gmail.com</a>> wrote:<br><br><br>If your car is Positive ground the timing light will not work. If you are <br>positive ground you will need to use another battery to power the timing <br>light.<br><br><br><br><br>David Nock<br><a href="mailto:healeydoc@sbcglobal.net">healeydoc@sbcglobal.net</a><br>209 948 8767<br>www.britishcarspecialists.com<br><br>Help us have our Founder Norman Nock inducteed into the<br>British Sportscar Hall of Fame, You can vote for your favorites<br>by visiting the site at.<br>www.britishsportscarhall.org<br>-----Original Message----- <br>From: <a href="mailto:sentenac.rw@gmail.com">sentenac.rw@gmail.com</a><br>Sent: Monday, March 11, 2019 10:13 PM<br>To: Michael Oritt<br>Cc: Healeys<br>Subject: Re: [Healeys] *** SPAM ***Re: Timing light query (OOPS)<br><br>The problems I was mentioning only happen if you use the car's<br>batteries for a supply to the light. If you use an independent<br>battery and don't somehow link one side of the supply battery to the<br>car's chassis you shouldn't have a problem.<br>-R<br><br>On Mon, 11 Mar 2019 22:07:19 -0700, you wrote:<br><br>>Polarity also matters in a different way if your timing light has a<br>>metal case and one of the power leads is grounded to the case, as<br>>mine is. If you use a 'regular' timing light designed for negative<br>>grounds in a Healey with a positive ground system, and if you then<br>>touch the case to the chassis or engine you will get a lot of sparks<br>>at a minimum, and maybe do some welding where you had not intended to.<br>><br>>-Roland<br>>BN1 #724<br>><br>>On Mon, 11 Mar 2019 21:32:53 -0400, Michael Oritt wrote:<br>><br>>>Simon--<br>>><br>>>The 12VDC lead does not need to go to the battery, merely a source of <br>>>power<br>>>whether or not it is part of your car's electrical system. I don't know<br>>>how your engine is configured but you can take power off of the starter<br>>>solenoid, coil hot lead, etc. etc. Polarity does matter, however.<br>>><br>>>Best--Michael Oritt<br>>><br>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" rel="noopener" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" rel="noopener" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive" rel="noopener" target="_blank">http://autox.team.net/archive</a><br><br><a href="mailto:Healeys@autox.team.net">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" rel="noopener" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <br><a href="http://autox.team.net/mailman/options/healeys/healeydoc@gmail.com" rel="noopener" target="_blank">http://autox.team.net/mailman/options/healeys/healeydoc@gmail.com</a><br><br>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" rel="noopener" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" rel="noopener" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive" rel="noopener" target="_blank">http://autox.team.net/archive</a><br><br><a href="mailto:Healeys@autox.team.net">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" rel="noopener" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/r.alkins001@comcast.net" rel="noopener" target="_blank">http://autox.team.net/mailman/options/healeys/r.alkins001@comcast.net</a></blockquote></body></html>