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  1. pb4ugo

    72 chevota wiring help please

    @franklin40 , I have to make a correction. The idiot light is NOT to be grounded. You'll have the alt #1 terminal wire going to the light. Instead of grounding the light it needs to be connected to a source that is hot when the ING/ key is On/hot. The light turns on when the key is turned...
  2. pb4ugo

    72 chevota wiring help please

    I need to ad the GM alt plug with pigtails is available at most a/p stores in their electronic section. If your idle is low upon start up the light may still stay on, a little rpm will turn it off. That's normal. If you decide to not use the sensing/terminal #1 wire the alt still should...
  3. pb4ugo

    72 chevota wiring help please

    You'll just be disconnecting the ammeter and connect those 2 wires together(WL&W). I used a small nut & bolt and nut and a bunch of tape.
  4. pb4ugo

    72 chevota wiring help please

    Ok, 1st lets talk about the stk wiring with the Toyota alt and the external VR. The alt wh/blue wire(WL) supplies voltage to the VR and fuse box and also connects to the neg side of the Ammeter. The positive side of the ammeter white(W) wire goes to the Batt. The wiring done this way shows...
  5. pb4ugo

    72 chevota wiring help please

    If you use the diagram # 2a, you won't be using the white/Blue wire, which imo, is a good thing. You should run a new large wire from the alt large post to the batt. Your red wire #2 from the small plug loops to the large post on the alt also. The #1 terminal on the small plug would be the...
  6. pb4ugo

    72 chevota wiring help please

    Accuracy? The stock gauge doesn't have any numbers on it.:) I used Toyota # 90404-16160 to adapt the stock temp sender to my sbc. I used the drivers side cyldr head which is typically GM's stock location for the sender. I try to avoid a bunch of wires running on top of my engine. I think I...
  7. pb4ugo

    72 chevota wiring help please

    I did the same. I think eliminating the ammeter and running the alt charge wire to the batt is a much safer setup.
  8. pb4ugo

    72 chevota wiring help please

    I edited and corrected the temp sensor thread to M16-1.50. In the above post.
  9. pb4ugo

    72 chevota wiring help please

    According to Rockauto looking up temp senders for 72 and 77 the temp senders threads are the same(M16-1.50). I looked at standard motor products reference sheets. I think I purchased my adaptor from the local Toyota dealer. It fit my cylder head. I believe the differences between 72 and 77...
  10. pb4ugo

    72 chevota wiring help please

    I guess if you wanted to cut out the WR you could. If you leave it alone it will be hot at the VR plug which should be protected by the plug itself and no longer plugged in. The FJ40's white wire at the batt will need a fusible link and will be suppling power to the harness if you go by the...
  11. pb4ugo

    72 chevota wiring help please

    If you go by Booch's figure 2A you will no longer be using the WL wire. It will be hot but no longer hooked up, mines seal up and hidden into the harness. It needs to be made so it doesn't ground out. According to the Coolerman diagram the WR goes to the voltage regulator. Looking at your...
  12. pb4ugo

    72 chevota wiring help please

    So looking at the links from your screen shot, the one listed just below 72-73 FJ40 is close enuff. The schematic is listed as 72-73 on the diagram. There are subtle differences thru the yrs but the charging systems wiring is essentially the same, and the wire id doesn't really change...
  13. pb4ugo

    72 chevota wiring help please

    On his site at the top of the green panel is a link to schematics. Then scroll down to 72 73 model i think its from a Haynes manual. You're going to have to get familiar with diagrams. The color codes tell what each wire does and where it goes. I wish we could say do this or that, but your...
  14. pb4ugo

    72 chevota wiring help please

    Coolermans website should have a Haynes 72 diagram plus others yrs, haynes and fsm. Most of the models use a lot of the same basic wiring. Checkout madelectricals website too. They have tech tips using the gm alt. There's good reading. I dont understand why your po did what he did. The bare...
  15. pb4ugo

    72 chevota wiring help please

    First I'd get rid of that wiring diagram. You can go to Coolermans website globalsoftware-inc and find a better one. The white blue is the charge wire coming off the stk alt. It looks like you have a mess on your hands. Personally id cut out all the non syk wiring and start over You can then...
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