Question about Toyota Supra

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Thank you for your quick answer to my alternater problem. But I was kinda hoping to find out what each of the three wires on the multi pin connecter went to. Ya see one place that tested my alternator only connected the case ground, positive battery post, and only one of the pins from the multi pin output. And it tested fine. two other places connected all three and it failed. I was wondering if i could bypass the other to pins and still use it? Once again this is for a 84 celica supra. 2.8Lt, 6cyc. Thanks

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Three wires 'normal' alternator uses:

  • a battery wire
  • ignition/warning light wire
  • voltage sensing wire: voltage sensing is used when you want the alternator to read voltage at some other point than the battery
Depending on your alterantor, you can also have 'self exciting' alternators that only requires two wires (battery and ignition) or even one wire (battery).

You really need to know what you are doing to install a subsitute alternator with different wiring or risk 'frying' your car electrical!

Posted on Oct 01, 2010


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1998nissan sendra doesn't charge but the battery light goes off when i start the engine when I remove bartery terminal engine stop running

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Solution at hand. I chased the harness to the gearbox. I methodically electrically earth tested each wire-to-switch and visually checked each wire for breaks whilst another kept turning on and off the 4wd switcth on shift. Eventually, at the rear end of the gearbox there is a multi connector of some several wires. One end had a female and the other exposed male pins. On counting the pins I noticed that one pin, on recollection green/red wire had been drawn back into the connector so not making a contact. I therefore, pushed the pin back through so to make a connection. All of the 4wd pneumatics, light on dash and front axles switches now work. That one wire caused total shutdown of the High 4wd system. I assume that during either off-roading or average road use an object, like a branch, fouled the rear connector and dislodged the wire connection.

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TO remove :

  1. With the ignition OFF, disconnect the negative battery cable.
  2. Remove the power steering pump. Refer to for the complete procedure.
  3. Remove the cruise control actuator but do not disconnect the actuator cable; simply move the unit out of the way with the cable attached.
  4. Unplug the multi-pin electrical connector.
  5. Remove the terminal nut and remove the wire from the terminal.
  6. Loosen the adjusting bolt; remove the alternator nut.
  7. Remove the belt from the alternator pulley.
  8. Remove the adjusting bolt, the lower through-bolt and the small support stay.
  9. Support the alternator. Remove the upper through-bolt and remove the alternator.
  10. If desired, remove the alternator mounting brackets.
  11. If the alternator brackets were removed, reinstall them. Coat the bolts with a thread sealer or liquid thread lock. Install the bracket bolts and tighten them to 36 ft. lbs. (50 Nm).
  12. Fit the alternator into place. Install the upper through-bolt and tighten it to 33 ft. lbs. (45 Nm).
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  14. Install the belt. Install the alternator nut. Adjust the belt tension. Tighten the alternator nut to 19 ft. lbs. (26 Nm).
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1 Vacant
2 Intake manifold preheating relay (carburettor models) or fuel
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3 Seat belt warning system relay
4 Gearshift indicator control unit
5 Air conditioner relay
6 Dual tone horn relay
7 Relay for foglights and rear foglight
8 Relief relay for X contact
10 Intermittent wash/wipe relay
11 Rear window wiper relay
12 Turn signal flasher or trailer towing warning relay
13 Seat belt warning system (interlock) or rear window, driving
lights and oil pressure warning relay
14 Window lift or seat belt warning system relay
15 Headlight washer relay
16 Control unit for idling speed increase
17 Fuse for rear foglight
18 Control unit for coolant shortage indicator
19 Thermo fuse for window lifters
20 Switch unit for heated driver’s seat
21 Switch unit for heated passenger’s seat
22 Switch unit for overrun cut-off
23 Vacant
24 Vacant
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Not all relays are fitted to all models
A Multi-pin connector (blue) for dash panel loom
B Multi-pin connector (red) for dash panel loom
C Multi-pin connector (yellow) for engine compartment loom left
D Multi-pin connector (white) for engine compartment loom right
E Multi-pin connector (black) for rear wiring loom
G Single connector
H Multi-pin connector (brown) for air conditioner or wiring loom
K Multi-pin connector (transparent) for seat belt warning system
L Multi-pin connector (black) for lighting switch terminal 56 and
dip and flasher switch terminal 56b (carburettor models) or
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M Multi-pin connector (black) for lighting switch terminal 56 and
dip and flasher switch terminal 56b (injection models)
N Single connector for separate fuse (manifold heater element)
P Single connector (terminal 30)
R Not in use
Fuse colours
Blue 5A
Green 30A
Red 10A
Yellow 20A

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