CB power

On Thu, 13 Sep 2007 19:56:57 GMT, twaldron
> wrote:

>Mike Romain wrote:
>
>> twaldron wrote:
>>
>>> Mike Romain wrote:
>>>
>>>> twaldron wrote:
>>>>
>>>>> Mike Romain wrote:
>>>>>
>>>>>> twaldron wrote:
>>>>>>
>>>>>>> Mike Romain wrote:
>>>>>>>
>>>>>>>> Fusing the negative line is very important because if the vehicle
>>>>>>>> loses
>>>>>>>> a ground for whatever reason. it can/will pull one through the
>>>>>>>> transmitter and let the magic smoke out of the transmitter big time.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> I would NEVER fuse the electrical ground line because if that fuse
>>>>>>> happens to go...and fuses do go...your radio circuit WILL find an
>>>>>>> alternate ground path and you will not likely appreciate it's
>>>>>>> choice. The likelihood of a body ground strap going bad is far
>>>>>>> less likely than a simple inline fuse. If you're paranoid about
>>>>>>> body straps going bad, replace it during your radio installation.
>>>>>>>
>>>>>>> tw
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> 'I' had to 'go by the book' or be liable for lost vehicle warranties.
>>>>>>
>>>>>> http://service.gm.com/techlineinfo/radio.html
>>>>>>
>>>>>> Most vans/vehicles have plastic to mount to these days, a chassis
>>>>>> case ground must be made if wanted.
>>>>>>
>>>>>> Mike
>>>>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>>>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
>>>>>> Canadian Off Road Trips Photos: Non members can still view!
>>>>>> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>>>>> (More Off Road album links at bottom of the view page)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Yep, I understand why you're doing it, but I don't understand why
>>>>> they're requiring it. Warranty aside, no one has been able to show
>>>>> me why the NEG lead fuse is necessary/warranted...or even safe.
>>>>>
>>>>> tw
>>>>
>>>>
>>>>
>>>> The definition of DC is a build up of negative electrons wanting to
>>>> go to a positive source so technically if a short happens the power
>>>> has to travel through the CB first, spiking it with power to get to
>>>> the fuse to blow. When both are fused and something happens, the
>>>> negative fuse normally blows first for some reason. (from 9 years of
>>>> observations and repairs)
>>>>
>>>> Mike
>>>
>>>
>>>
>>> I guess it depends on which direction the problem comes from.
>>> Sidenote...About 7 years ago, I had a neighbor's tree fall on the
>>> power lines, effectively creating a 440v short. This energy came
>>> barreling down my power line and entered the back of my big screen
>>> HDTV, somehow skipped past the quick blow fuse and fried a main
>>> circuit board. I lost a bunch of equipment that day. The fuse
>>> eventually went, but not before the damage was done.
>>>
>>> tw
>>
>>
>> In my mind it is simple, I just fuse both of the suckers and be done
>> with it. That 2A fuse isn't going to let the starter or headlights draw
>> through the CB, that's for sure...
>>
>> Mike
>
>
>Yeah, I'll have to rethink that. Thanks for hashing it out.

The Chrysler TSB dealing with installing radio communication equipment
specifically states NOT to fuse the ground lead. Apparently the
manufacturers can't agree on this either.

>
>tw

bllsht wrote:
>
> The Chrysler TSB dealing with installing radio communication equipment
> specifically states NOT to fuse the ground lead. Apparently the
> manufacturers can't agree on this either.
>

That is a serious pain in the butt isn't it?

I think of all the body ground straps I have seen go bad on Jeeps so
things like the headlights 'could' pull a chassis ground to the CB then
to the negative lead to the battery. Even the starter could pull the
other way through the body ground strap and back through the
transmitters negative, if the big ground goes bad at the block which I
have 'also' seen happen on Jeeps more than once.

I figure fusing both with the light 2A fuse has it covered...

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)