Author Topic: Stud 55, Not Energized  (Read 1425 times)

Offline brianzero

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Stud 55, Not Energized
« on: October 11, 2017, 06:35:25 PM »
My stud 55 at my front electrical box doesnt have any 12v current, and is dead. Is there a fuse or relay that might effect this?

Offline bevans6

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Re: Stud 55, Not Energized
« Reply #1 on: October 11, 2017, 07:04:33 PM »
Look in the upper right hand corner of the battery bay, 10 amp fuse in an automotive twist-in fuse holder.

Brian
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia

Offline brianzero

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Re: Stud 55, Not Energized
« Reply #2 on: October 11, 2017, 07:09:03 PM »
I checked that fuse and it looks 'OK'. Is there another place to look?

Offline bevans6

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Re: Stud 55, Not Energized
« Reply #3 on: October 11, 2017, 07:25:09 PM »
That circuit goes from the center electrode of the battery bank, to the AC electrical panel (stud 6)on the top of the forward luggage bay to the front electrical panel.  Only three spots to check, use a trouble light or a DVM and find out where it's broken.  It's probably a bad fuse or a corroded connection.

Brian
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia

Offline gumpy

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Re: Stud 55, Not Energized
« Reply #4 on: October 12, 2017, 05:01:35 AM »
Did you have 12v on Stud 55 before and now it's not there?

12V was an option from the factory. It may not be connected in the A/C junction box. 
Craig Shepard
Located in Minnesquito

http://bus.gumpydog.com - "Some Assembly Required"

Offline brianzero

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Re: Stud 55, Not Energized
« Reply #5 on: October 12, 2017, 06:18:50 AM »
The PO had the stereo and some other 12v specific electronics tied to stud 55, thus, it probably had the 12v option. Ill have a look inside a/c box to see whats going on.

Offline bevans6

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Re: Stud 55, Not Energized
« Reply #6 on: October 12, 2017, 07:08:31 AM »
The type of fuse and fuse holder they used in the battery bay for the 12V feed is notorious for looking good and being bad, and for internal corrosion.  That is almost certainly the problem, but a little work with a test light will tell the tale.  Wires that worked rarely disconnect themselves.
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia

Offline brianzero

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Re: Stud 55, Not Energized
« Reply #7 on: October 12, 2017, 02:02:02 PM »
That fuse holder was indeed dead. The fuse was good.

Dumb question; is this wire running from the battery terminal to the fuse holder positive or negative? PO had this on the negative terminal.

Offline gumpy

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Re: Stud 55, Not Energized
« Reply #8 on: October 12, 2017, 02:44:17 PM »
That fuse holder was indeed dead. The fuse was good.

Dumb question; is this wire running from the battery terminal to the fuse holder positive or negative? PO had this on the negative terminal.

Apparently my previous answer was too confusing for the common man.

To answer your specific question, the wire running from the battery terminal to the fuse holder is positive 12v.
« Last Edit: October 12, 2017, 07:22:04 PM by gumpy »
Craig Shepard
Located in Minnesquito

http://bus.gumpydog.com - "Some Assembly Required"

Offline eagle19952

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Re: Stud 55, Not Energized
« Reply #9 on: October 12, 2017, 04:42:26 PM »
Negative terminal of which battery?

It should be connected to either end of the jumper between the two batteries. Either the positive terminal of the left battery, or the negative terminal of the right battery. That will give you 12 volts to ground.

i'm sure he's good and confused now  ???
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

Offline gumpy

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Re: Stud 55, Not Energized
« Reply #10 on: October 12, 2017, 04:45:42 PM »
i'm sure he's good and confused now  ???

I clarified it.
« Last Edit: October 12, 2017, 07:22:26 PM by gumpy »
Craig Shepard
Located in Minnesquito

http://bus.gumpydog.com - "Some Assembly Required"

Offline eagle19952

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Re: Stud 55, Not Energized
« Reply #11 on: October 12, 2017, 04:54:08 PM »
Can't imagine why, if he reads it as it's written. It is absolutely correct. The 12v connection can go on either post stated. They happen to be the two posts connected together by the center jumper.

not everyone knows what you do....
on first look...it would be a head scratch for sure.
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

Offline gumpy

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Re: Stud 55, Not Energized
« Reply #12 on: October 12, 2017, 05:10:09 PM »
...
« Last Edit: October 12, 2017, 07:23:19 PM by gumpy »
Craig Shepard
Located in Minnesquito

http://bus.gumpydog.com - "Some Assembly Required"

Offline eagle19952

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Re: Stud 55, Not Energized
« Reply #13 on: October 12, 2017, 06:37:41 PM »
He has an MC9. If he prints it out and takes it to the bus and looks at the batteries as he reads it, it will be perfectly obvious. It has nothing to do with "what I do". It has everything to do with the way 12v is produced from a 24V bus.  I have no idea if an Eagle is a 12v or 24v battery, so it may or may not make sense to you, but I'm pretty sure MCI owners will understand it.

Now, if you'd like to take a shot at answering his questing in a manner that is completely obvious and understandable to everyone, including you, have at it. Otherwise, STHU!






i was not picking at you. just commenting generally...so you STFU. if he knew everything you assume...he wouldn't be here asking . now would he.
« Last Edit: October 12, 2017, 06:39:44 PM by eagle19952 »
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

Offline B_K

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Re: Stud 55, Not Energized
« Reply #14 on: October 12, 2017, 09:11:35 PM »
i was not picking at you. just commenting generally...so you STFU. if he knew everything you assume...he wouldn't be here asking . now would he.


My my come on let's act like adults here. I mean winter hasn't even started yet!
;D  BK  ;D