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yel-mel
Samba Member
Joined: May 07, 2015
Posts: 436
Location: Tampa Florida
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 Posted: Wed Dec 04, 2024 1:55 pm Post subject: Quick timing gun question |
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What is the best place to grab pos,neg, & ground besides the coil ?
I have a newer style timing gun & am currently setting my rpms.
Thanks |
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heimlich 
VWNOS.com
Joined: November 20, 2016
Posts: 7247
Location: Houston, Texas
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| Posted: Wed Dec 04, 2024 2:56 pm Post subject: Re: Quick timing gun question |
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The battery.
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runamoc
Samba Member
Joined: June 19, 2006
Posts: 5894
Location: 37.5N 77.1W
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| Posted: Wed Dec 04, 2024 3:06 pm Post subject: Re: Quick timing gun question |
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| Quote: |
| best place to grab pos,neg, & ground |
If it has an alternator, get pos. from the B+ stud and ground from the housing of the alternator too
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 78431
Location: Sneaking up behind you
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| Posted: Wed Dec 04, 2024 3:28 pm Post subject: Re: Quick timing gun question |
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| runamoc wrote: |
| Quote: |
| best place to grab pos,neg, & ground |
If it has an alternator, get pos. from the B+ stud and ground from the housing of the alternator too |
^^^^^
THIS
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 10371
Location: Oregon
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| Posted: Wed Dec 04, 2024 7:56 pm Post subject: Re: Quick timing gun question |
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If the car has a generator, Use a auxiliary battery to power the timing gun.
]'ve used a aux battery for years to time my generator equipped engines.
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 35195
Location: Conejo Valley, CA
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| Posted: Thu Dec 05, 2024 9:32 am Post subject: Re: Quick timing gun question |
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I've gotten away on a generator car using either the gen output (but only at low rpm so the voltage is not too high), or even the coil wire (I know, a no-no), but I don't recommend either!
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runamoc
Samba Member
Joined: June 19, 2006
Posts: 5894
Location: 37.5N 77.1W
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| Posted: Thu Dec 05, 2024 10:30 am Post subject: Re: Quick timing gun question |
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| KTPhil wrote: |
| I've gotten away on a generator car using either the gen output (but only at low rpm so the voltage is not too high), or even the coil wire (I know, a no-no), but I don't recommend either! |
I have a 009 distributor  can't set the timing at low RPMs.
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 35195
Location: Conejo Valley, CA
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| Posted: Thu Dec 05, 2024 10:35 am Post subject: Re: Quick timing gun question |
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My suggestion for the 009 folks is to set it at high rpm as is proper practice, then lit it get cold and using a test light, manually rotate the engine and see where it comes on, then put a paint mark there on the pulley. You can then set it static and cold without any fancy tools.
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zerotofifty
Samba Member
Joined: December 27, 2003
Posts: 2793
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| Posted: Thu Dec 05, 2024 10:48 am Post subject: Re: Quick timing gun question |
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I get the light power off the generator/alternator in 12 volt cars. In case of my 6 volt Bug, My light is 12 volt, so I get 12 volts from a my near by 12 volt car or from my 12 volt jumper battery.
Always have a battery cover on your battery in your Bug. Seat spring can short the battery if they touch, and the result can be the seat catching fire, You may be fine, until a heavy object or person is set, or sits over the battery, then poof, you got a fire. Happened to someone I know when a bunch of kids piled into the rear seat. He had no battery cover. He was able to get out and toss the burning seat cushion out of the car in time to save the car. Seat wrecked. |
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wdfifteen
Samba Member
Joined: January 26, 2019
Posts: 634
Location: Ohio
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| Posted: Thu Dec 05, 2024 12:54 pm Post subject: Re: Quick timing gun question |
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| 67rustavenger wrote: |
If the car has a generator, Use a auxiliary battery to power the timing gun.
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+100
I do this when using a 12 volt timing light on a 6 volt car.
I don't know about your experience, but I found out the painful way that you need to ground the timing light to the car! Mine is a 50 year old Sears light with a metal body, so this might not apply to other lights, but the current from the spark plug wire has to go somewhere, and in my case it was to me. |
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Dangermouse
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Joined: November 23, 2005
Posts: 1292
Location: Beautiful New Zealand
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| Posted: Thu Dec 05, 2024 3:32 pm Post subject: Re: Quick timing gun question |
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Same wrt using a 12V timing light for 6V car but doubly so when it comes to reading dwell. I could not get an accurate or stable dwell readout when using a fancy digital timing light (powered by a separate 12V battery) until I added an additional ground wire back to the vehicle; it was perfect after that.
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