 Coil wires? |
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| Geezer914 |
 Jun 4 2011, 02:55 PM
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#1
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Geezer914  Group: Members Posts: 1,417 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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 Throw the wiring diagram out the window! Can anyone tell me how these wires are attatched to the coil? All three are black, but the single wire has a blueish cast. I can not find the black and purple wire for the tach. Both wires are hot when the key is in the run position. What is with the small and large wires attached together? Stumped!!! Car is a 1975 914 L Jet injection. |
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| JeffBowlsby |
Jun 4 2011, 03:09 PM
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#2
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914 Wiring Harnesses Group: Members Posts: 8,510 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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http://bowlsby.net/914/WiringHarnesses/Har..._74-75L-Jet.pdf
Your welcome! The paired wires at the coil are a single circuit that connects to the double relay. |
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| jim_hoyland |
Jun 4 2011, 03:21 PM
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#3
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Get that VIN ? Group: Members Posts: 9,301 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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The 12 pin connecter at the rear of the relay board ihas slots numbered like:
1 2 3 4 5 6 7 8 9 10 11 12 I have a '75 LJet too: The black wire originates from pin seven and goes to the +coil AND to 86C of the dual relay. The dual relay has a left and right side: 86C is on the left side toward the rear of the car and to the right ( see Jeff's diagram, it's # 9 ) The tach wire originates from pin 5 ( corrected) and goes to the -coil. The purple trace may have faded. There is also a white or grey trigger wire that goes to the - coil I don't have points, someone else may chime in here |
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| Geezer914 |
Jun 4 2011, 03:47 PM
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#4
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Geezer914 Group: Members Posts: 1,417 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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So the two wires connect together go to the + side of the coil. If the single wire is the tach wire, and connects to the - side, why is it hot with the key on? Thanks for the quick replys
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| jim_hoyland |
Jun 4 2011, 03:59 PM
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#5
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Get that VIN ? Group: Members Posts: 9,301 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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Tach wire must go to - coil. The hot blacks to to the + coil and to 86C of dual relay
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| Geezer914 |
Jun 4 2011, 04:23 PM
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#6
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Geezer914 Group: Members Posts: 1,417 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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Why is the tach wire hot with the key on? We had it hooked up to the - side of the coil and it was shorting the coil and not sending spark to the plug wires.
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| jim_hoyland |
Jun 4 2011, 05:56 PM
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#7
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Get that VIN ? Group: Members Posts: 9,301 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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You verified it is the tach wire ?
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| Geezer914 |
Jun 4 2011, 07:50 PM
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#8
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Geezer914 Group: Members Posts: 1,417 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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That's all the wires in that harness. The single black wire should be the tach wire. But like I said it's hot with the key on. How can I check to be shure its the tach wire?
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| jim_hoyland |
Jun 4 2011, 08:39 PM
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#9
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Get that VIN ? Group: Members Posts: 9,301 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(Geezer914 @ Jun 4 2011, 06:50 PM)  That's all the wires in that harness. The single black wire should be the tach wire. But like I said it's hot with the key on. How can I check to be shure its the tach wire? Disconnect the 12 pin connector at the rear of the relay board; disconnect all wires from the coil; then, do a continuity test from pin 5 ( not seven) on the 12 pin connector to each of your suspected tach wires. *** Corrections: Pin 5 is Tach |
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| Geezer914 |
Jun 5 2011, 03:26 AM
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#10
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Geezer914 Group: Members Posts: 1,417 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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Thanks every one for all your help!
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