 Trigger Points Plug 3 Wires, Which is which? |
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| Jackba |
 Jan 8 2019, 04:12 PM
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#1
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Newbie  Group: Members Posts: 40 Joined: 13-July 18 From: Sacramento Member No.: 22,308 Region Association: Northern California  |
I somehow pulled the 3 wires out of the plug that connects to the trigger points. One wire is darker than the two others. Does anyone know which wire goes where in the plug?
Thanks in advance, Jack |
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| Jackba |
Jan 8 2019, 04:28 PM
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#2
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Newbie Group: Members Posts: 40 Joined: 13-July 18 From: Sacramento Member No.: 22,308 Region Association: Northern California |
Here is a photo:
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| mgphoto |
Jan 8 2019, 04:39 PM
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#3
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
QUOTE(Jackba @ Jan 8 2019, 02:28 PM)  Here is a photo: I believe the center is ground, the other 2 are the contacts. Use an ohm meter to determine which is the ground, the wires are all supposed to be white. |
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| Jackba |
Jan 8 2019, 04:45 PM
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#4
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Newbie Group: Members Posts: 40 Joined: 13-July 18 From: Sacramento Member No.: 22,308 Region Association: Northern California |
Once I detect the ground are the other two interchangeable?
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| JeffBowlsby |
Jan 8 2019, 06:41 PM
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#5
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914 Wiring Harnesses Group: Members Posts: 8,502 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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There is no 'ground'. Test the wires for continuity at the ECU plug. Wires 12, 21, 22. See attached diagram. Their order is critical.
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| Jackba |
Jan 8 2019, 07:09 PM
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#6
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Newbie Group: Members Posts: 40 Joined: 13-July 18 From: Sacramento Member No.: 22,308 Region Association: Northern California |
Well, I checked to determine which of the 3 was the ground wire and was surprised to see that all three are grounded...
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| Jackba |
Jan 8 2019, 07:36 PM
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#7
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Newbie Group: Members Posts: 40 Joined: 13-July 18 From: Sacramento Member No.: 22,308 Region Association: Northern California |
Thanks a million Jeff!
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| JeffBowlsby |
Jan 8 2019, 08:04 PM
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#8
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914 Wiring Harnesses Group: Members Posts: 8,502 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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QUOTE(Jackba @ Jan 8 2019, 05:09 PM) Well, I checked to determine which of the 3 was the ground wire and was surprised to see that all three are grounded... Ooohhh thats not good. wire 12 is common, but I dont think its ground, unless the ECU is telling it is ground. The trigger points are just two back to back switches, switched by the cam on the dizzy. |
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| Tbrown4x4 |
Jan 9 2019, 10:04 AM
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#9
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Senior Member Group: Members Posts: 703 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None
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Did you disconnect the ECU and just check which wires go to pins 12, 21, and 22 in the ECU connector?
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| Olympic 914 |
Jan 9 2019, 10:14 AM
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#10
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Group: Members Posts: 1,663 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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QUOTE(JeffBowlsby @ Jan 8 2019, 07:41 PM) There is no 'ground'. Test the wires for continuity at the ECU plug. Wires 12, 21, 22. See attached diagram. Their order is critical. Great diagram. (IMG:style_emoticons/default/beer.gif) |
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| jack20 |
Jan 9 2019, 11:21 AM
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#11
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Member Group: Members Posts: 406 Joined: 7-November 14 From: Granite Bay, CA Member No.: 18,099 Region Association: Northern California
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QUOTE(Tbrown4x4 @ Jan 9 2019, 08:04 AM) Did you disconnect the ECU and just check which wires go to pins 12, 21, and 22 in the ECU connector? Thanks for the question. I haven't done anything yet. I hope to pull out the ECU and check continuity this weekend. I can't imagine there is anything seriously wrong because the car was running prior to pulling the distributor to change points and condenser. The leads pulled out of the plug during this process. Something simple turned into a PITA... |
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| Tbrown4x4 |
Jan 9 2019, 01:11 PM
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#12
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Senior Member Group: Members Posts: 703 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None
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I didn't mean to imply anything was wrong. I just meant you need to isolate the 3 wires electrically in order to trace them to their proper pins at the ECU connector.
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| jack20 |
Jan 9 2019, 01:28 PM
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#13
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Member Group: Members Posts: 406 Joined: 7-November 14 From: Granite Bay, CA Member No.: 18,099 Region Association: Northern California
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Oh, got it. I was referring to Jeff's comment that has me a bit worried given his expertise on the system. I just hope it's nothing serious.
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