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willysmjeeps.com :: View topic - Circuit Breakers
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Circuit Breakers

 
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Madriver1968
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Joined: Nov 27, 2016
Posts: 58
Location: Washington DC

PostPosted: Sun Apr 02, 2017 8:51 pm    Post subject: Circuit Breakers Reply with quote

I've done a lot of reading on the forum about circuit breakers and the reasoning behind the decision not to include them in the M38A1 design.

My question is this -- have folks added M38 circuit breakers to their M38A1s?

Thanks!

B.
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wesk
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Joined: Apr 04, 2005
Posts: 14449
Location: Wisconsin

PostPosted: Sun Apr 02, 2017 10:33 pm    Post subject: Reply with quote

I am a firm believer in circuit protection. Especially when we want to protect our investment in these 24 volt jeeps. 24V makes a bigger smoke cloud very much faster than a 12 volt system. At over $700 a harness whay would anyone not protect their wiring and their jeep?

If you look up Klixon they are still in the same Circuit Protection business today. Just purchase the appropriate rated CB's and insert them in each circuit. Their parent company today is Sensata - Klixon subsidiary.
http://klixon.com/klixon/circuit-breaker-thermal-9115.htm

Here's the Catalog you want: http://www.sensata.com/download/klixon-circuit-breaker-thermal-catalog.pdf

If you have any of the post bendix light switches then you already have a built in lighting system CB in the switch. So you can ignore lighting and just take care of the other circuits.

A battery cut-off switch is a very good device to add while you are at it.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Madriver1968
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Joined: Nov 27, 2016
Posts: 58
Location: Washington DC

PostPosted: Mon Apr 03, 2017 2:42 pm    Post subject: Reply with quote

Thanks so much again, Wes! I really appreciate it. I already installed a battery cut off switch -- growing up around old cars, that was the first thing I did when I brought the Willys home.

Do you happen to have suggestions about where to install circuit breakers and what rating? Any additional wisdom is most appreciated.

Again, thanks.
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wesk
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Location: Wisconsin

PostPosted: Mon Apr 03, 2017 7:23 pm    Post subject: Reply with quote

If your circuits are all stock just use the early M38 wiring diagram with the CB's.


You just get one of these mount brackets off an old M38 cowl battery box or fabricate one just like it and install it on the driver's side of your M38A1 cowl battery box.


Then add the 3 CB's. It's very difficult to get original Douglas metal shell connector CB's but the Packard rubber shells are easy to adapt.



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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Hawkshadow
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Joined: Oct 10, 2012
Posts: 310
Location: Toronto, Ontario, Canada

PostPosted: Mon Apr 03, 2017 8:23 pm    Post subject: Reply with quote

Original:


The mount that I made out of some sheet with nuts welded to the rear for mounting the breakers.


The whole unit mounted in place with NOS breakers.

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Jordan

M38 CDN
52-30718
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4x4M38
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Joined: May 30, 2014
Posts: 2911
Location: Texas Hill Country

PostPosted: Mon Apr 03, 2017 8:55 pm    Post subject: Reply with quote

Very nice Jordan.
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Brian
1950 M38
MC11481
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Madriver1968
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Location: Washington DC

PostPosted: Tue Apr 04, 2017 6:39 am    Post subject: Reply with quote

Thanks again guys. I appreciate it!
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Madriver1968
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Joined: Nov 27, 2016
Posts: 58
Location: Washington DC

PostPosted: Mon May 01, 2017 9:38 am    Post subject: Reply with quote

Hi guys,

I'm getting ready to install the circuit breakers on my M38A1, and I've run into another question. My wiring harness has a wire, marked 11, that according to the wiring diagrams in TM 9-8014 is connected to the ignition switch. However, in reviewing wiring diagrams for the M38, I see that wire 11 runs from the ignition switch to the first breaker, and then from the first breaker to the second, and from the second to the third.

For my M38A1 wiring harness, do I simply ignore the wire marked 11, and put a bag around it with a zip tie?

Thanks!

B.
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wesk
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Posts: 14449
Location: Wisconsin

PostPosted: Mon May 01, 2017 10:10 am    Post subject: Reply with quote


I showed #10 going all the way across to the switch which is out of site because 10 supplies power to the three CB's and the ignition switch. It becomes #11 at the switch pig tail that is marked 11.

Wire 11 provides power to your ignition switch for wire #12 that powers the coil. You must connect 11 to the end of 10.


In this early m38 diagram wire # 11 is simply picking up power at the last CB that wire #10 supplied with power.

Something else for you to think about is that center CB is for the light switch power feed. The old early M38 light switches did not have a built in CB. The later switches all do so you can actually use that 15 amp CB for another accessory.

You must realize that the individual system wiring diagrams do not show all the wires that connect to those CB's.


This one shows wire # 15 going from the center CB to the light switch.

What you will actually end up with is:



Wire # 10 going to a dual connector to feed both wire # 11 at the ignition switch and wire # 15 to the main light switch.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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Z
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Joined: Mar 27, 2017
Posts: 28

PostPosted: Wed Jun 19, 2019 7:14 pm    Post subject: Reply with quote

Is the wire connecting the breaker or any wires to/from the breaker larger AWG than #14 wire? Thanks!
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Z
52 M38 (61033) Restoration goal is to make a solid on and off-road runner.
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