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Engine overheat help

Discussion in 'Everything Else (off topic)' started by Well Seasoned, Dec 3, 2021.

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  1. Warner

    Warner

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    Put the black clamp of the jumper cables on the neg of the battery in your truck then the black clamp at the other end on the new eyelet you put on the wire.
     
    Warner, Dec 12, 2021
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  2. Warner

    Warner

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    Just pay close attention to polarity you do not want to do any welding or letting the magic smoke out. If you don’t know all electronic devices contain magic smoke that make them work unfortunately if you let it out of the component it’s toast.
     
    Warner, Dec 12, 2021
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  3. Well Seasoned

    Well Seasoned Administrator

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    I'm stumped! Ran the new fixed rear wire to the negative on battery. No luck with lights yet. Engine shut down when i took the jumper off, fired up with it on. I did this twice with the same results. Strange
     
    Well Seasoned, Dec 12, 2021
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  4. Well Seasoned

    Well Seasoned Administrator

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    These black fuse things have continually gotten warm through the process the other day and today. The ones on the left only

    20211212_122005.jpg
     
    Well Seasoned, Dec 12, 2021
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  5. Warner

    Warner

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    There may be additional grounds on the frame in the back. The black things are relays it’s not uncommon for them to get warm not hot.
     
    Warner, Dec 12, 2021
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  6. Well Seasoned

    Well Seasoned Administrator

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    I REALLY looked for more again. Yes the broken one was missed the other night since the spare tire was in the way, but im not seeing anything else.

    I cleaned and tightened 4 grounds on the passenger side fender, one on the driver side. Found two along the frame driver side, one being thr broken one and fixed today.

    Another from the neg battery post to the engine block and the braided heat tape one running from the firewall to the block

    Ugggggg!
     
    Well Seasoned, Dec 12, 2021
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  7. Well Seasoned

    Well Seasoned Administrator

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    Where would the pcm be?
     
    Well Seasoned, Dec 12, 2021
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  8. Warner

    Warner

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    Rectangular box with three large connectors by the battery. Pcm has little to do with the rear lights. They are controlled by the body control module in passenger kick panel.
     
    Warner, Dec 12, 2021
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  9. Warner

    Warner

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    Do you have a test light?
     
    Warner, Dec 12, 2021
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  10. Well Seasoned

    Well Seasoned Administrator

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    Yes
     
    Well Seasoned, Dec 12, 2021
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  11. Well Seasoned

    Well Seasoned Administrator

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    There is no relay in the pcm spot in thr engine fuse box
     
    Well Seasoned, Dec 12, 2021
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  12. Warner

    Warner

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    Yes there is, the location should be listed in the owners manual. But if the truck starts the pcm relay is working.
     
    Warner, Dec 12, 2021
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  13. Warner

    Warner

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    image.jpg The red g400 is pointing to the ground for the plate lamps take a look there.
     
    Warner, Dec 12, 2021
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  14. Well Seasoned

    Well Seasoned Administrator

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    Thx.....


    Put left turn signal on, both flash. Same if i switch them. Brake lights work. No running lights or plate lights..... wierd

    I'm checking the plate lights
     
    Well Seasoned, Dec 12, 2021
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  15. Well Seasoned

    Well Seasoned Administrator

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    Plate lamp wires appear to be ok. Thr only ground i see is the one i fixed....
     
    Well Seasoned, Dec 12, 2021
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  16. Warner

    Warner

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    A0513565-D601-4EE6-A2BD-1F9CFDD85DF2.jpeg F857254A-DEC7-4F86-9FCB-089AAE57EBEF.jpeg Wire diagrams from Ford show both the tail lamps and license plate lamps using g400 the ground in the other pic.
     
    Warner, Dec 12, 2021
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  17. Well Seasoned

    Well Seasoned Administrator

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    Is there a way to bypass them?
     
    Well Seasoned, Dec 12, 2021
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  18. Well Seasoned

    Well Seasoned Administrator

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    Thanks everyone so much for your help i want to Express my gratitude
     
    Well Seasoned, Dec 12, 2021
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  19. Warner

    Warner

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    You could cut the black with white wire and attach the socket side to the the battery neg via the jumper cable.

    at the plate lamp socket.
     
    Warner, Dec 12, 2021
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  20. Well Seasoned

    Well Seasoned Administrator

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    I did do that but worth a try again.

    This wire, the only one i found at the rear


    20211212_140204.jpg
     
    Well Seasoned, Dec 12, 2021
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