Please help me understand this wiring
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Thread: Please help me understand this wiring

  1. #1
    FRESHMAN ROVER
    Join Date
    June 10th, 2019
    Location
    Rockville, Maryland
    Posts
    3

    Please help me understand this wiring

    This is out of a 1993 RRC. Please help me figure this out. After spending several hours on my truck trying to diagnosed why it won't start I realized this wire may be the offender. The wire with the black connector and red dot was loose/broken from the end and came right out. Now, this is my question. There is a ring that connects to the chassis, so it is grounded. The wire with the black connector and red dot was connected to another wire with a 12v reading. There was no voltage reading coming out of the other black connector going into the coil? So, what kind of reading was I expected to get at the coil? 12v or simply ground? It does not make any sense to me. If am supposed to get 12v to the coil with this wire why is going to ground? what is the purpose of this design? Thanks.

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  3. #2
    FRESHMAN ROVER
    Join Date
    April 15th, 2014
    Location
    Wimbledon UK
    Posts
    242

    Re: Please help me understand this wiring

    I don't understand either, so went to look at mine to confirm what's installed.

    Coil has two wires coming from distributor, one is volts + the other is switched volts negative. It's the negative that's switched by the ignition amplifier to trigger sparks. Overview is, with ignition on, volts + goes live to supply coil and ready to work, crank engine and the negative line will pulse to fire the the coil.

    One other wire comes from low tension coil posts, this goes into the loom connected to MAF airflow meter and supplies a pulse count to the ecu in order that it can be informed of engine speed.
    It uses this for ecu function but also if no signal here then the ecu will switch off the fuel pump, think the lower threshold is 500rpm to cut fuel pump logic.

  4. #3
    FRESHMAN ROVER
    Join Date
    June 10th, 2019
    Location
    Rockville, Maryland
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    3

    Re: Please help me understand this wiring

    Here is a picture so you guys can see it, but it won't let me?

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  6. #4
    SOPHOMORE ROVER
    Join Date
    February 18th, 2008
    Location
    Portland, Maine
    Posts
    328

    Re: Please help me understand this wiring

    I saw your pic on dweb (https://discoweb.org/index.php?threa.../#post-1091649) and I've never seem this before. Looks kind of homemade. Maybe aftermarket capacitor?
    Kevin
    88 RRC "Audrey"

  7. #5
    FRESHMAN ROVER
    Join Date
    June 10th, 2019
    Location
    Rockville, Maryland
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    3

    Re: Please help me understand this wiring

    Hey Kevin,

    Thanks for the reply. The capacitor is next to my coil on my truck. This wire must be something else. I'm puzzled, as the black connector with the red dot hooks to another 12v line, but there was no reading coming out of the other back connector that goes to the coil. Maybe the wire is broken somewhere within, which prevented the reading. Not sure..........

  8. #6
    SENIOR ROVER
    Join Date
    June 11th, 2016
    Location
    northern va 22003
    Posts
    1,367

    Re: Please help me understand this wiring

    it is indeed the capacitor pigtail.
    2k p38 4.6
    95 lwb 4.6
    01 d2 4.0

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