 Coil Wire Question, 1975 LJet only |
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| jim_hoyland |
 Oct 22 2006, 01:55 PM
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#1
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Get that VIN ?  Group: Members Posts: 9,277 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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The run runs fine. My question is why threre are two black wires from the ignition harness to the + coil terminal. One is the Key On? but what is the second for ?
My picture shows the coil with the center wire off; the tach wire is baby blue( PO handywork) and green is condener--both go to -. The red is for a rich/lean sensor I.m just curious whether othe '75 L jets have two blacks to the + Thanks Attached image(s) 
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| bd1308 |
Oct 22 2006, 01:58 PM
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#2
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
All three versions of L-Jet I have had on my car has had the 2 wire thing going to the coil.
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| jim_hoyland |
Oct 22 2006, 02:03 PM
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#3
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Get that VIN ? Group: Members Posts: 9,277 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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OK. Do they originate from diffrent terminals on the harness connector at the relay board ? Still want to know what the reason is.
QUOTE(bd1308 @ Oct 22 2006, 12:58 PM)  All three versions of L-Jet I have had on my car has had the 2 wire thing going to the coil. |
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| bd1308 |
Oct 22 2006, 02:16 PM
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#4
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
I'll look when I go on break, I'm at work right now. I have a feeling, but I want ot be 100% sure.
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| eeyore |
Oct 22 2006, 02:31 PM
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#5
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Senior Member Group: Members Posts: 889 Joined: 8-January 04 From: meridian, id Member No.: 1,533 Region Association: None |
IIRC, the black wire grounds to the case, joins the harness under the shealth, runs over to the coil, comes back off the coil, goes back under the sheath and continues on to the double relay (which controls the fuel pump)
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| bd1308 |
Oct 22 2006, 02:34 PM
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#6
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
black is 12V, not ground.
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| eeyore |
Oct 22 2006, 02:36 PM
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#7
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Senior Member Group: Members Posts: 889 Joined: 8-January 04 From: meridian, id Member No.: 1,533 Region Association: None |
Oops. OK. Not ground then. But it still goes on to the double relay?
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| jim_hoyland |
Oct 22 2006, 02:37 PM
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#8
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Get that VIN ? Group: Members Posts: 9,277 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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That makes sense; it probably activates the dual relay when the ignition is turned on.
Reason I'm asking; I want to redo some of the wiring and incorporate an MSD that's been siting on the work bench for the past year or so. Anyone done an 1.8L LJet FI with MSD ? QUOTE(Cloudbuster @ Oct 22 2006, 01:31 PM) IIRC, the black wire grounds to the case, joins the harness under the shealth, runs over to the coil, comes back off the coil, goes back under the sheath and continues on to the double relay (which controls the fuel pump) |
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