Question about 1992 Lexus Sc 300

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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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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


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 -

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
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gauge female spade connectors, 2-14 gauge female spade connectors, 1-10 gauge
and 1-14 gauge ring connector. Soldering gun, wire


  1. Disconnect battery. Put a ring connector on one end of the 10
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  2. Run it through the hole next to the powermaster where all the
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  3. Just a word of caution. Follow the wires down to the side of the
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    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
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  4. The ground wire from the relay (a small piece of 14 gauge from
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  5. Run the remaining heavy gauge wire from the "Power Out" prong
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  7. Now the wire coming through the firewall goes over behind the
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  8. When you turn on the ignition, you should hear the fuel pump
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