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#1 |
Registered User
Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
Posts: 1,404
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I installed a new wire harness for the engine, modified for HEI ign. There's a yellow wire that terminates at the starter. I know on a point ign., this would go to the dist., and on HEI ign., this is to be disconnected and taped off. What I was wondering, could I connect it, and somewhere behind the engine, use it as 12V to my electric choke. I mean it's key hot right? Why couldn't I connect it at the starter, and terminate it at the electric choke? I could install an inline fuse to CMA against burning it up. Any ideas? Any help would be appreciated. Thanx
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![]() ![]() ![]() LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! ![]() ![]() |
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#2 |
Registered User
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Location: The Other Maine!
Posts: 2,236
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The yellow wire that goes to the r post on the starter is a resistor wire and it will not run 12 volts. It would be closer to 9v. Use another wire.
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1968 Chevy 4x4 307 4 speed |
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#3 |
Senior Member
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Location: Tucson, AZ USA
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Mike's right. It has 12 vdc initially, but as it heats up resistance increases and voltage drops to 7 vdc. It was originally designed to keep the points from burning up.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#4 | |
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Join Date: Nov 2003
Location: Alexandria, VA
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Quote:
With the key in the "start" position the starter solenoid contacts close providing a full 12 volts to the + terminal of your ign. coil via that yellow wire, and after the key is released to the "on" position those contacts open and now the resistor wire (which by the way drops voltage to approx. 8 volts) is providing power to the + terminal of the coil thus prolonging the life of the point contacts.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction. ![]() ![]() ![]() |
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#5 | |
Senior Member
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Location: Tucson, AZ USA
Posts: 7,276
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Quote:
![]() ![]() ![]() ![]() ... after a good time on St Paddy's nite, I can't recollect for certain ALL the little avenues in the engine harness circuit, no matter how long I'd had that rig? ![]()
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 03-18-2005 at 05:32 AM. |
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#6 |
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Join Date: Apr 2002
Location: New Carlisle, Ohio,USA
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MMMM, now I gotta break out my wiring diagram and trouble light again. Any ideas on which wire I could use? Or will I hafta run another wire?
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#7 |
Senior Member
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Location: Tucson, AZ USA
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Just run a new line from an empty Ign On tap in the fuse block, thru the firewall and out to your choke. That way you know it's not draining volts from some other service. Doesn't have to be a large diameter wire. 18 - 22 ga. should be fine, chokes don't draw a lot of current. A different color from the other lines in that end of the harness will help troubleshooting later. You can bundle the new line with zip ties or Eastwood sells OEM type non-stick vinyl black tape if you want the original look.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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That isn't a resistance wire, It does carry 12 volts, He's asking about the yellow wire that would take 12 volts from the starter while cranking the engine and send the full increased voltage to the coil fort easier starts.
However, it still wouldn't work becouse that wire is only hot when you are twisting the key. |
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#9 |
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Location: The Other Maine!
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My 71 GMC has a yellow resister wire. That threw me off. I am BAD so slap me Andy.
![]() The resistor wire does run off the ign. switch only on the run position. I was wrong and Andy is right. ![]()
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1968 Chevy 4x4 307 4 speed |
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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That's right...same answer, different reason.
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#11 |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
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to choke or not to choke
![]() I agree with 68orange that you should run a completely separate wire to feed the coil and make sure it is fused and key on hot only or you will have a battery drain problem. VetteVet-- is there an echo in here? LOL
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#12 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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ECHO ECHO ECHO ECHO ECHO ;
![]() The new wire needs to be hot in both crank and in run...if it is an acc location, it'll be turned off when you crank the engine, which makes starting interesting at the least. IMO, a 25 amp fuse is good. If you wind the motor real hard, it needs all the amps it can get. I honestly run a 30 amp on mine. It'll still blow out if it gets shorted out. |
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#13 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Andy I meant to say choke coil not hei coil. I'm trying to figure how he's going to feed the choke coil off the key switch without grounding the hei feed wire off the hot key on position. Your're right the start and run both have to be hot to the hei coil.
My Haynes shows the later model schematics run the choke coil in the start or run key switch position so I figure the choke coil must have enough resistance to not ground the ignition coil out. VetteVet
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#14 |
More Cowbell....
Join Date: Mar 2004
Location: Puckett, MS
Posts: 3,569
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Mine has the same setup. White 'braided' wire to a splice that turns into a pair of yellow wires.
MY QUESTION: Can I leave one of those yellows on the starter (like it originally was), and use the other yellow to trigger a relay that will allow FULL BATTERY 12+ volts to flow to the HEI? Even if that yellow wire drops to 7 or 8 volts, that will still trigger my relay, right? I have no problem yanking the white wire out and replacing it with a new "pink" wire, but why wouldn't the realy idea work?? ANYONE? INPUT?
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There once was a member from Puckett.....Who ( fill in the blank blank blank ) bucket |
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#15 |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
Posts: 8,714
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Ignition diagram
Hey guys I just found this site on google for a 74 nova that shows a schematic and besides it gives a lot of info on HEI stuff. Take a look.
http://rmcavoy.freeshell.org/HEI.html VV
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#16 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Putter, yes, that would work.
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