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02-09-2011, 10:40 AM
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CC Member
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Join Date: Mar 2010
Location: East Bay,
CA
Cobra Make, Engine: B&B,351w
Posts: 61
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Not Ranked
Timing light leads when battery is in trunk?
Hey guys,
I'm borrowing a friends timing light and was wondering if it's okay to hook up the positive lead to the back of my alternative? I have a self exciting (1 wire) alternator, the battery is in the trunk.
I don't want to fry this guys timig gun so any help is appreciated.
Thanks,
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02-09-2011, 10:46 AM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,979
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Not Ranked
Do you have a starter selenoid on your firewall? Use the batter side of that if you do.
__________________
Remember, It's never too early to start beefing up your obituary.
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02-09-2011, 11:05 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
Quote:
Originally Posted by mbeers6
Hey guys,
I'm borrowing a friends timing light and was wondering if it's okay to hook up the positive lead to the back of my alternative? I have a self exciting (1 wire) alternator, the battery is in the trunk.
I don't want to fry this guys timig gun so any help is appreciated.
Thanks,
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i had the same problem, after making some scary arcs from putting my light leads in precarious locations i installed one of these on my firewall, makes life alot easier.
can be had from most auto stores like NAPA,.......
__________________
Fred B
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02-09-2011, 11:10 AM
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CC Member
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Join Date: Mar 2010
Location: East Bay,
CA
Cobra Make, Engine: B&B,351w
Posts: 61
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Not Ranked
Quote:
Originally Posted by xlr8or
Do you have a starter selenoid on your firewall? Use the batter side of that if you do.
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Yes, but it's on the wrong side of the firewall  It is underneath the dash.
I guess I could just pull the battery from my toyota and put it on the ground to be safe.
Thanks for the info on the Bussmann, I'll look into that. |
02-09-2011, 11:16 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Attach the positive (red)to the cable on the starter solenoid, whether it is on the fire wall or at the starter itself. An alternative would be a "hot" wire at the fuse box. Keep all attaching cables free of the headers. You friend will thank you for it.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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02-09-2011, 11:20 AM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
I connect the positive lead of my timing light to the positive output on the back of my alternator.
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02-09-2011, 11:24 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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as a side benefit, the bussman really cleaned up the underhood wiring. i used it as my positive lead to all the extra stuff. it got direct feed from the battery and has 1\4-20 studs as posts, so you can put a really heavy wire on it and its a fuse block too.
__________________
Fred B
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02-09-2011, 01:56 PM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
I ran the battery to a large aluminum plate that was engine-turned. It works great for connecting power.
Use the big fuse before the plate is you decide to put a connecting stud.
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I'm a writer, feed the artist and buy a book.
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02-09-2011, 04:07 PM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
Clip the red lead from the timing light to the red terminal on the rear of the alternator. Clip the black timing light lead to any ground source and the light should work just fine. That's how I do it.
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Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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02-09-2011, 04:44 PM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,527
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Not Ranked
That's an interesting question. I had a Pontiac Trans Am in the 70s that I moved the battery to the trunk in - I did a lot of tuning on it but I can't remember how I powered my timing light. I must have put the lead on the starter solenoid where the battery positive lead terminated??? It's hell getting old.
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02-09-2011, 06:34 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
or you could get a battery operated light
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Fred B
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02-09-2011, 06:45 PM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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Not Ranked
Use a pair of jumper cables, connect to battery in trunk and timing light.
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02-09-2011, 08:12 PM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Not Ranked
I just always use an extra battery on the ground.
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" It ain't no big deal"
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02-10-2011, 06:13 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
I also use the alternator hot lead
Roscoe
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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02-10-2011, 07:28 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Years ago I used the 12 volt positive connection on the COIL and the other lead to ground. That works on standard ignition systems. It does NOT work with MSD ignition. Turns out the MSD can supply as much as four hundred volts to the plus side of the coil. Blew out the timing light in a heart beat.... |
02-10-2011, 11:46 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,527
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Not Ranked
Quote:
Originally Posted by Excaliber
Years ago I used the 12 volt positive connection on the COIL and the other lead to ground. That works on standard ignition systems. It does NOT work with MSD ignition. Turns out the MSD can supply as much as four hundred volts to the plus side of the coil. Blew out the timing light in a heart beat.... |
Now that you mention the coil I think that may be what I use to do with my old Trans Am with a trunk mounted battery. Hooked it up to the coil and ground like a dwell meter. Should of remembered that. |
02-10-2011, 02:31 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,405
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Not Ranked
Consider for a moment...What range of voltages come off the alternators hot lead, especially if you connect the timing light between the alternator and the voltage regulator. Be sure your timing light can handle the higher voltage...Since most newer timing light are multi-purpose tools they should be ok. But the older - single purpose timing lights my get toasted...
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02-10-2011, 04:50 PM
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CC Member
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Join Date: Oct 2006
Location: Huntsville,
AL
Cobra Make, Engine: SOLD-SPO2660, Southern Automotive 406FE, TKO-600
Posts: 65
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Not Ranked
Any one have personal experience with the MSD AA battery powered unit? Specs says it's good to 5000rpm. I'm in the market for a timing light, this one would eliminate concern of where to pick up power.
Thanks!
__________________
Joe
Have fun and enjoy life, because when it is over, it is too late!
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02-10-2011, 05:07 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
Quote:
Originally Posted by JST4FUN
Any one have personal experience with the MSD AA battery powered unit? Specs says it's good to 5000rpm. I'm in the market for a timing light, this one would eliminate concern of where to pick up power.
Thanks!
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I have one and it works great.
I just make sure to always remove the batteries when I'm done using it.
__________________
John Hall
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02-10-2011, 06:06 PM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
I have an MSD digital ignition and use the alternator. It's on the same side as the dampner.
Roscoe
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Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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