Radio Receptable and Harness Assembly.

horse · Posted: Sat Jan 07, 2023 1:15 pm Post subject:

I would like to add an inline fuse between the battery plus and the Radio Receptical.

What would be the best amp fuse to put in line for the 24Volt system?

Horse.
_________________
1952 M38

wesk · Posted: Sat Jan 07, 2023 2:13 pm Post subject:

Inserting a main breaker where one never existed nor was ever called for is really not necessary. A manual shutoff is a better idea. Problem with inserting a new uncalled for in line CB is it has to be rated for a max load which when exceeded will pop the breaker. Well unfortunately that max load interruption will usually occur too late since the lighter load units could easily get damaged waiting for the new main CB to pop. Each of your individual units should already have their own circuit protection.

If I have not been able to change your mind then to answer your original question you will need to review the data plates on each of your individual radio units to determine normal loads or current draw for each unit.
_________________
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

RonD2 · Posted: Sat Jan 07, 2023 3:15 pm Post subject:

Hi Horse,
I agree with Wes.

Looking at my copy of TM11-286 (March 1951) for the Radio Sets VRC-8, VRC-9, and VRC-10, the PP-112 Power Supply has 4 fuses on the front panel already protecting the components of the entire radio set.

I haven't looked in my copy of TM11-289 for the Receiver-Transmitters RT-66, RT-67, and RT-68 but you may find additional pertinent information about built-in circuit protection.

More protection (fuse or circuit breaker) shouldn't be necessary and could be counter-productive as Wes mentioned by giving you a false sense of security (protection) where none exists (except for a total melt-down).
"Double protection" ("belt and suspenders") for electrical stuff isn't generally a good idea.

Installing a cut-off switch as Wes suggests might be a good idea --- but keep in mind that switch must also be properly rated to handle the load.
The Manuals I mentioned have all the electrical specs you'll need to select one.
And cut-off switches (like all switches) should always be installed on the hot leg, not the ground leg.

If the Army thought a cut-off switch or additional circuit protection was necessary they would've installed it?
Pretty sure the Soldier would just disconnect the power cable(s) where he needed to isolate a component.

Good luck!
_________________
Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

horse · Posted: Sat Jan 07, 2023 4:20 pm Post subject:

Thank you Wes and Ron for your replies After reading the first couple of pages from the TM on Power supplies which talks about artificial respiration procedures it made me think.

You have changed my mind and will just keep the Radio unplugged at the receptical plug as suggested.

I have still the aerial side to set up before the big switch on.

Horse.
_________________
1952 M38


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