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Thread: Need wiring help

  1. #1

    Default Need wiring help

    I am putting in new mechanical op and temp gauges and a 12V fuel gauge. I still have a 24V system so I will come off 1 battery for the 12V for fuel gauge. I'll use toggle switch to turn gauge off. Then I was gona clean up the wiring by removing some toggle switches and a push button switch which were for extra lights and a siren. One of the toggle switches has a piece (About 4") of factory wiring going to it with the # 490 on it. I looked in a schematic I found trying to find out what circuit 490 is. It goes from H on trailer plug to # 24 wire, looks very short. Another schematic for lighting only doesn't show anything there. Since I have a piece of 490 that was under my dash, I assume it used to be back at trailer plug. I haven't looked back there yet to see if I see where it was removed from. What was the H on trailer plug for and why is it shown on 1 schematic and not on the other?

    My flashers don't work. To save me time trying to figure out how to troubleshoot this, does any one have a good procedure? There is current coming to steering column because it it lights up when I move lever? My truck is 7-67 delivery date #12631.

  2. #2
    Join Date
    Sep 1998
    North Central Wisconsin


    This is an early truck with the large underhood distribution box not the later solid state type turn signals I think?

    Its not good to draw more off one battery than the other by tapping one for 12 volts...the states of charge between the 2 will get farther apart until one goes bad...unless you charge the 2 batteries seperately on a regular basis.

    Wire 24 is: Light switch to blackout tail lamp
    Wire 490 is a short wire spliced to wire #24 and runs to the trailer receptacle for the blackout tail lamp.
    Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.

    Pro-choice, that's a LIE, babies don't choose to die!!

  3. #3


    I do know about taking more off 1 battery isn't good. But fuel gauge? No more current than it draws surely it won't cause a problem. You check cells with hydrometer and in the old days when you could stick a volt gage on the lead straps between cells, there is always a difference in cell charge. Not much but some.

    I don't know if my flasher is solid state or not but I think it is. It has heat sink fins all over top id that helps identify it.

  4. #4


    According to the link below this is the pin-out description for the eight wires in the receptacle:

    F. B.O. STOP

    See this link for wire number descriptions:

    What style turn signal system do you have?
    Both can be seen in this link:

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