Electrical gremlins

Discussion in 'Interior/Electronics' started by jetas, Jul 18, 2014.

  1. jetas

    jetas Grand Toyotaholic

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    Hey guys, im trying to get my 72.5 going, but the previous owner swapped a 20R into it but there are many wires cut from the passenger side harness.

    Is there one wire to the fuses? Or are there multiple and what side of the engine bay do i need to look at?

    Also there is nothing between the alt and battery. Do i just run one straight between them?

    A wire diagram would be lovely but i cant seem to find one online for the second en hilux
     
  2. jetas

    jetas Grand Toyotaholic

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    Ok so im starting to think whoever did the swap had no clue what they were doing. I have 8 or 9 wires cut off and not going anywhere. Theyre all from the harness coming through the passenger side of the firewall.

    Heres a shot of all the wires.

    [​IMG]

    [​IMG]

    Anyone have a diagram of the fuse panel and what fuses go where? This one is torn to sh!t

    The thicker white one im assuming goes straight to the battery?

    Are any of these to the choke, coolant temp sensor, oil pressure sensor, oil dummy light? Or the headlights, horn or turn signals?

    I dont know how many of the wires from the 18R are compatible with the 20R, trying to make semse of all this crap.
     
  3. jetas

    jetas Grand Toyotaholic

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    Ok so ive been trying to tackle the chopped up wiring and im starting to think i need to just;
    A. Find a OEM harness at the junkyard in better shape
    B. Purchase an aftermarket harness

    If i were to get another OEM harness, are all 1972.5- 1978 the same? Im sure there was a change because if the engine change. My truck already has a 20R in it that someone swapped in. What year harness should i look for?

    Has anyone used an aftermarket harness and had it successfully work?

    Help me out guys.
     
  4. jetas

    jetas Grand Toyotaholic

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    Still havent given up. But i havent gotten very far either. Can anyone tell me what color wire goes to the oil pressure sensor and ignition coil?
     
  5. disturbio

    disturbio Enthusiast

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    I will look in the manual tonight and check. Mine are all painted over when previous owner shot it
     
  6. jetas

    jetas Grand Toyotaholic

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    Thanks bro. Ive been going thru the diagrams autozone has. And ive gotten rid off all the no factory wires. Its just akward because its already got a 20R swapped in im just not sure what harness is in it.
     
  7. jetas

    jetas Grand Toyotaholic

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    Still dealing with these issues slowly.

    Can anyone tell me what color wires go to the starter solenoid, oil pressure sensor dummy light, and ignition coil?

    Also what gauge wite gose from the batt to the fuse panel??
     
  8. Mikerocosms

    Mikerocosms Veteran

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    On my 90 pickup I just did the big 3 which is larger 0-4gauge wire to battery, ground, starter and alternator. You can do that.

    I had a direct lead (no fuse) from power terminal to starter.

    I then traced my alternator wires there were two (not counting the plug in the back). One went from alternator to fuse block (80amp) to battery. The other went into the fender area towards dash (I left that one alone. Basically I snipped off the one that went to the battery replaced it with 4gauge keeping the 80 amp fuse and left the other wire (that went toward dash) attached. If I were you I would put at least an 80 amp fuse if you don't have one from battery to alternator.

    Then put 4gauge ground to both frame and block. I also added one to the body.


    That's the big 3 in a nutshell. I would definitely stick with the wiring you have fixing it and just get rid of "loose end" wires. Keep hunting for a diagram and/or trace your wires.


    M
     
  9. jetas

    jetas Grand Toyotaholic

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    I had to do the grounds already because the PO had the battery grounded to the cylinder head and nothing to the chassis. Got some 4 gaige to the starter from the battery too. Just need to get one from the alt to the battery.

    All ive had to go off of was a diagram from autozones website.

    Im hoping to work on it this weekend.
     
  10. Randy justice hilux

    Randy justice hilux Newbie

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    What year is your truck
     
  11. jetas

    jetas Grand Toyotaholic

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    1972 second gen
     

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