Question about 1992 Lexus Sc 300

1 Answer

Wire color scheme for alternator plug.

92 Lexus SC300 6 cyl.
I cut lose the 3 prong plug to the alternator and did not remember which wire goes where into the back of the plug. There is a yellow, tan and black/white wire

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  • ricbrandon7 Jan 18, 2009

    Sorry, the colors are white, black/yellow and yellow/green.
    The plug has 2 parallel slots and 1 slots is rotated 90 degrees. The diagram look right but not sure which slots 1 & 2

  • ricbrandon7 Jan 18, 2009

    I have the connector. I cut it loose from the wire harness and forgot to look to see which wire went in which fitting. If you give me your e-mail I will send you pictures of the connector casing. Or I can send it via text.
    Ric 817-905-2557


  • ricbrandon7 Jan 20, 2009

    I found a connector at the salvage yard today. The wires are white, black and yellow. So I got that hooked up but now, I cannot get the belt on the alternator.

    There is a single pulley just under the condenser pulley to the left that is attached to an flat arm that is attached to the block. It has a strange looking star shaped spline in the center that looks like you need a special tool to turn it to release that pulley to get the belt on.

    Ric 817-905-2557
    Does this sound familiar to you????

  • Rick Byrd
    Rick Byrd May 11, 2010

    did you leave the old connector in the old alt. and turn it in for a core and now its gone ? does the alt have any letters stamped by where the plug is like F , I , S or something ?

  • Rick Byrd
    Rick Byrd May 11, 2010

    i checked from 92 - 96 , sc300 & sc400 , this is the only option that shows up everytime . hope that helps .now i'm really currious .



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  • 379 Answers

Ok ric , now the tensioner , notice a 15mm bolt head on the tensioner pulley , put a wrench on that 15mm head and turn clockwise , that will unload the tensioner , install your belt according to the belt wrap picture under the hood , release tensioner , and you should be good to go . however ,,,,,
last thing , there are like 5 fuses involved in this circuit , 1.) a 120 amp fuse in the fuse block , left side of engine compartment , 2.) a 60 amp fuse in the same place as #1 , 3.) a 7.5 amp fuse in the relay box - left side of engine compartment , 4.) a 7.5 amp in the left side of dash fuse panel , and 5.) another 7.5 amp fuse in the same panel as #4 . sure is a very well protected circuit ..

good job

J5

Posted on Jan 20, 2009

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How to hot wire fuel pump for 97


How to
Hot Wire Your Fuel Pump With a Relay in the Trunk




Terry Littleton - tlnfm@peganet.com


You Will Need

Get 15 ft 10 gauge wire, 3 ft 14 gauge wire, and a Bosch 4 or 5
prong 30 amp relay. Any place that installs car alarms should have a Bosch
relay. Get a heavy 10/12 gauge wire 30 amp fuse holder. They can be found at
auto parts stores and come in the old glass or new plastic spade type fuses.
Make sure it is heavy wire and not like most that use like 14/16 gauge wire. You
will need 2-10 gauge butt connectors, 1-10 to 16 gauge butt connector, 2-10
gauge female spade connectors, 2-14 gauge female spade connectors, 1-10 gauge
and 1-14 gauge ring connector. Soldering gun, wire
protector.

Procedure



  1. Disconnect battery. Put a ring connector on one end of the 10
    gauge fuse wire and attach that to the post at the rear of the alternator. Run
    it over to the front of the drivers side valve cover and attach to a piece of
    ten gauge wire that you will run to the back of the car. I put mine inside the
    car and it was actually easier.



  2. Run it through the hole next to the powermaster where all the
    wires go through the firewall. I routed it over behind the emer brake pedal,
    down behind that kick panel, took off the sill plate and put it inside the
    plastic wire protector (it does come open, just a pain to figure it out). Take
    out back seat and run it from sill up to opening that goes into the trunk. There
    are other wires that do the same thing, just follow them. Bring wire down to the
    hinge support. There is already a hole right there to put a bolt and nut through
    to mount the relay. I had a radioshack relay but it broke so I got a
    Bosch
    and it seems a lot sturdier. Good choice.

  3. Just a word of caution. Follow the wires down to the side of the
    trunk floor. The copper colored wire is the one to attach the trigger wire to.
    It looks like bare copper wire but is actually coated. The coating is so hard, a
    regular scotch lock wouldn\'t make contack on mine, so I cut out a half inch
    section of the insulation and soldered the trigger wire (a small piece of 14
    gauge from the relay prong 86) to there. I wrapped it in tape and put corrugated
    wire guard over it.



  4. The ground wire from the relay (a small piece of 14 gauge from
    prong 85) can go to the bolt hole you use to mount it to the hinge support. Just
    clean off the paint first. Then hook up the 10 gauge wire from the alternator to
    post 30 on the relay. The remaining prong on a 4 prong relay is the "Power Out"
    that will feed the alternator voltage to the pump(s). If you have a 5 prong
    relay the two remaining prongs should be labeled 87 and 87a. One is the "Power
    Out" when relay is energized, the other supplies power when the relay is not
    energized. Use a test light to determine.



  5. Run the remaining heavy gauge wire from the "Power Out" prong
    (when energized) from the relay through the rear of the trunk to the fuel pump.
    Notice the plastic cover over the BIG rubber grommet that takes all those other
    wires from the trunk out under the back of the car? Forget about getting your
    new ten gauge wire through there. Just drill a hole big enough to run the wire
    through covered with some corrugated protector. I put mine right next to the
    rubber plug. Then run the ten gauge wire to the pump.



  6. The 3 wires going to the sender/pump are Black-Ground,
    Pink-Fuel Level Sender, and Brown/White Stripe-Fuel Pump motor. Cut the
    Brown/White stripe wire after the connector on the fuel pump side and attach the
    new ten gauge wire. Leave enough to reconnect stock later if desired. Put a butt
    connector on the old cut wire so it doesn\'t short on anything. I wire tied stuff
    up neat and used wire protector. If you have an external pump, you can run
    another piece of 10 gauge to it for power from where it splices into the
    original pump wire.



  7. Now the wire coming through the firewall goes over behind the
    drivers valve cover and along the back edge of it under the EGR tubing in wire
    protector and splices into the other fuse wire from the
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  8. When you turn on the ignition, you should hear the fuel pump
    prime. The only problem I had was in the connection of the trigger wire to that
    copper colored wire in the trunk like I mentioned above.

Hope this isn\'t confusing. I did it this way to keep things neat
in the engine compartment.

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