Timing light question

356 Porsche-related discussions and questions.
Post Reply
Message
Author
Jim Beam
356 Fan
Posts: 405
Joined: Sat Mar 29, 2008 3:23 pm
Location: Albuquerque, New Mexico

Timing light question

#1 Post by Jim Beam »

1963B Normal. 12 volt. I want to check/set timing using a timing light. Timing light power leads - red and black. Is there a power source in the engine bay to connect the red lead to? Black attached to ground at engine. The leads are not long enough to reach all the way to the battery up front. Thanks.
1963B (T6) Coupe
1987 3.2 Carrera
1985 FJ60 Landcruiser
1993 Miata

User avatar
Doug McDonnell
356 Fan
Posts: 6081
Joined: Sat Apr 05, 2008 8:21 am
Location: Augusta,Michigan

Re: Timing light question

#2 Post by Doug McDonnell »

If your car is 12 Volt you have 12V at VR B+ terminal-easy to check.. Or you can use jumper pack, other 12 V battery even a battery charger.
Last edited by Doug McDonnell on Thu Oct 20, 2016 10:55 am, edited 1 time in total.
1965 356C 2000 BMW 740i Sport 1967 Honda CL77 There is never enough time to do it right, but always enough time to do it over.

User avatar
Neil Bardsley
356 Fan
Posts: 1100
Joined: Tue Mar 20, 2012 10:21 am
Location: London

Re: Timing light question

#3 Post by Neil Bardsley »

I connect my red lead to the left side of the coil

User avatar
Jacques Lefriant
356 Fan
Posts: 4656
Joined: Mon Dec 06, 2010 1:50 pm
Location: Washoe county NV

Re: Timing light question

#4 Post by Jacques Lefriant »

that is B+ on the voltage regulator(VR)
 

User avatar
Doug McDonnell
356 Fan
Posts: 6081
Joined: Sat Apr 05, 2008 8:21 am
Location: Augusta,Michigan

Re: Timing light question

#5 Post by Doug McDonnell »

Thanks Jacques I should not have assumed that everyone would understand that VR stood for Voltage Regulator since I have minimal electrical know how.
1965 356C 2000 BMW 740i Sport 1967 Honda CL77 There is never enough time to do it right, but always enough time to do it over.

User avatar
David Jones
Classifieds Moderator
Posts: 7341
Joined: Tue Mar 25, 2008 6:32 pm
Tag: I wish I knew as much as I think I know.
Location: Kentucky

Re: Timing light question

#6 Post by David Jones »

Timing lights consume a very small amount of power and can be run for hours on a low capacity 12 volt battery. Something like this, https://www.amazon.com/Volt-Amp-Hour-Al ... B0010XNC06
It can easily be recharged with a 12 volt battery maintainer.
6 volts will run most timing lights but the strobe light may not be bright enough for use in daylight.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
David Jones #9715

User avatar
Wes Bender
356 Fan
Posts: 4931
Joined: Wed Aug 27, 2008 10:54 am
Location: Somewhere in the Gadsden Purchase, USA

Re: Timing light question

#7 Post by Wes Bender »

When connecting to a separate 12 volt source, some timing lights require a jumper from the negative lead on the light to the car's ground. You already accomplish this if you connect to the car's electrical system.

Wes
Some days it's just not worth chewing through the restraints.....

User avatar
Richard Shilling
356 Fan
Posts: 790
Joined: Sun Apr 20, 2008 12:40 pm
Tag: Ex 356 Mechanic
Location: Shoreline, Washington, USA
Contact:

Re: Timing light question

#8 Post by Richard Shilling »

When I bought my timing light about 1964, I was convinced that it was 6/12 Volt. I used it professionally for years on both 6 and 12 volt cars. The last time I used it on my '65 C, I read the tag on the light and it said: 12 Volts! It works fine on 6 volts so if you have a 6 volt car, give it a try.
Richard Shilling
1965 356C dolphingrey 

Timothy Vick
356 Fan
Posts: 45
Joined: Tue May 10, 2016 1:50 am

Re: Timing light question

#9 Post by Timothy Vick »

I use a small motorcycle battery

User avatar
Mervyn Hyde
356 Fan
Posts: 797
Joined: Wed Nov 25, 2015 9:12 pm
Location: Sunshine Coast Australia

Re: Timing light question

#10 Post by Mervyn Hyde »

I have two solutions for the 12v power needed for the timing light on a 6v system. First at home I have an old computer transformer that outputs 12 to the timing light connections. On the road I have a cheap 6-12v converter that I can connect to the voltage regulation and also to the timing light.
Merv
TYP356
1963 356B T6
1968 911 SWB

Post Reply