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Thread: Building 68’ M715; converting to aCummins 4BT looking for guidance

  1. April 26th, 2020, 04:24 PM #1
    Bpmalo
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    Default Building 68’ M715; converting to aCummins 4BT looking for guidance

    Hey gang, brand new to the forum. Just bought today a 1968 M715. Best I have seen. No rust, bone stock and it’s all there.
    Want to put a cummins 4bt in it.
    Looking for advise from those that have done this.
    1) electrical, converting from 24v to 12v; best ways to do that.
    2) recommended axles
    3) do’s and don’t, things to do, look out for converting to the 4bt.
    Any advice you wish to drop on me is greatly appreciated.
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  2. April 26th, 2020, 04:25 PM #2
    Bpmalo
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    Default More pics

    Adding a few more...
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  3. April 26th, 2020, 07:03 PM #3
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    brute4c
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    WELCOME!!

    At the top of the page is a link to the Online Maintenance Manuals...lots of good stuff in there...ask away with questions too!
    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!!
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  4. April 26th, 2020, 09:55 PM #4
    Bpmalo
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    Thanks Brute, I missed the manuals. Wow...awesome. Thanks,
    I will have lots of questions!
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  5. April 27th, 2020, 06:07 AM #5
    ray steadward
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    Welcome! I know Mikel has a 4bt and 6bt truck and is usually great with pics so search for his threads. The 12 volt conversion might just be bulbs if you are already doing the alternator and starter...There is a good axle sticky at the top of modified and in some of the build threads...And ask away...
    Is that real money?
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  6. April 27th, 2020, 08:24 AM #6
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    brute4c
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    From what I can see under the hood, you have the early style turn signals with the large distribution box. Those boxes dont convert to 12 volt unless you are good at electronics and can redo the relays inside there...we have a page on that:
    http://www.m715zone.com/vb/view.php?...istbox_convert

    You also can convert the system to the newer style military turn signals setup, solid state type. This is documented on the following linked page:
    http://www.m715zone.com/vb/view.php?...signal_convert

    With either of these changes, the turn signal/lighting system will work on 12 volts as long as you also change the bulbs to 12 volt...the GE part numbers can be converted from 6 to 12 to 24 volt with this chart:
    http://www.m715zone.com/vb/pages/man...rsionChart.pdf

    If you want to mount the blackout light on the hood, you would need to convert it to 12 volt...we have a page on that too:
    http://www.m715zone.com/vb/view.php?...dlight_convert

    Those are all in the Online Manuals section in case you need them in the future.
    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!!
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  7. April 27th, 2020, 10:03 AM #7
    Bpmalo
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    That is great. I messaged Mikel. Thanks Ray!
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  8. April 27th, 2020, 10:04 AM #8
    Bpmalo
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    Brute, you are the man, this stuff is so helpful, I can’t thank you enough!
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  9. April 28th, 2020, 04:33 PM #9
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    venominjected
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    Any questions, let me know... axle and cummins swapped...

    Otherwise see my build thread too!

    http://www.m715zone.com/vb/showthread.php?t=27844



    67' M715/5.9 Cummins/ZF5/NP205
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