An Electrical Puzzle

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Re: An Electrical Puzzle

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Re: An Electrical Puzzle

Postby Fil Bonica » September 30th, 2018, 9:15 am

Once again , the key to the discussion is
Where the connections are made.
Typically the radios are connected to the battery not thru a cut off switch.
If it is done that way as was done on the vehicle then there is connection to ground via the radio’s negative lead and the antenna shield.
Do we agree?
Sorry for hijacking the topic.

Fil Bonica
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Re: An Electrical Puzzle

Postby rickf » September 30th, 2018, 6:16 pm

I guess I am missing something in the translation.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: An Electrical Puzzle

Postby kmam » September 30th, 2018, 6:42 pm

True Fil. But in service they did not have cutout or isolation switches. When one is fitted between battery negative and vehicle frame/body and the radio negative connection is to frame/body or the output of the cutout/isolator there is no possibility of the radio obtaining power via the coax or any other earth connection while ever the cutout/isolator is turned off.
Howard

Daimler Ferret Mk 1/2
AM General M151A2
RAAF Tactical Trailer
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Re: An Electrical Puzzle

Postby Fil Bonica » September 30th, 2018, 9:39 pm

We are in agreement.

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Re: An Electrical Puzzle

Postby rickf » October 1st, 2018, 8:43 am

I am glad to hear that but Howard said the same thing I did several times just using different words. No matter, we all agree on the radio bit. NOW, back to the original problem.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
rickf
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Re: An Electrical Puzzle

Postby kmam » October 3rd, 2018, 4:48 am

Well good news. The alternator is OK and if I need diodes in future the service guy believes he can come up with them. I have put it back in the MUTT and now I have no leakage, well a few mA only. Not sure what happened, why it showed leakage and why it is fixed. Perhaps when I pulled the circuit breakers, switches and instrument cluster out then pulled and reconnected the plugs something was corrected. Whatever, I am a happy mutter and I took it for a short drive today (rain dictated the length of the drive) and it ran nicely. Will try and get a long run in over the next few days.
Howard

Daimler Ferret Mk 1/2
AM General M151A2
RAAF Tactical Trailer
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Re: An Electrical Puzzle

Postby Fil Bonica » October 3rd, 2018, 8:59 am

Things that fix themselve are spooky!
I would continue to watch things.
If you know the make and model of the alternator you may be able to purchase the brdige assembly from Southern Automotive. Bought a set from them for my Prestolite some time ago.

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