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Unread 10-01-2013, 09:23 PM   #1
Sprung17
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Default To dual fuse or not to dual fuse...

So I've been searching all over the net trying to figure out if installing a fuse on both ground wire and positive wire is necessary on my mobile rig. I want to use just one fuse on the positive side, mainly because I've already ran the power and want to keep everything short and clean as possible.

For those who have installed a mobile ham radio, did you fuse both side or just the positive? Any issues with running just one?

I'm running the Yaesu FTM-400DR if anyone is curious to what rig I'm using.
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Unread 10-01-2013, 09:50 PM   #2
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So I've been searching all over the net trying to figure out if installing a fuse on both ground wire and positive wire is necessary on my mobile rig. I want to use just one fuse on the positive side, mainly because I've already ran the power and want to keep everything short and clean as possible.

For those who have installed a mobile ham radio, did you fuse both side or just the positive? Any issues with running just one?

I'm running the Yaesu FTM-400DR if anyone is curious to what rig I'm using.
EJ here... BOTH neg and pos fuses no questions asked
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Unread 10-01-2013, 10:08 PM   #3
Sprung17
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Cool beans. By the time I see you, I think all we'll be doing is playing with the radio. LoL Right now it seems to be all plug and play.
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Unread 10-01-2013, 10:16 PM   #4
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EJ here... BOTH neg and pos fuses no questions asked
EC here....I concur with EJ. Protect your investment!
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Unread 10-01-2013, 11:03 PM   #5
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Most ham radio rigs come with fuses on both the positive and negative sides of the power cord - keep them both to protect the radio from voltage spikes.
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Unread 10-02-2013, 06:52 AM   #6
Sprung17
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What's the reasoning for dual fuses? All my other 12V doodads only uses one fuse. What makes a ham radio so special? Does it think it is better than everything else? Does it want ice cream at 3:00AM and knows we're out of that frozen goodness and makes me go to 7-eleven just to pick up a jug of rocky road and by the time I bring it to her, she fell back asleep and doesn't want to be bothered by an ice cream wielding warrior of the not so distant past?

Will the ground fuse break if something is short?


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Unread 10-02-2013, 08:51 AM   #7
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What's the reasoning for dual fuses? All my other 12V doodads only uses one fuse. What makes a ham radio so special? Does it think it is better than everything else? Does it want ice cream at 3:00AM and knows we're out of that frozen goodness and makes me go to 7-eleven just to pick up a jug of rocky road and by the time I bring it to her, she fell back asleep and doesn't want to be bothered by an ice cream wielding warrior of the not so distant past?

Will the ground fuse break if something is short?


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Fuses on both + and -.

I learned from this site: Paraphrasing... current will take the path of least resistance and could ultimately fry your radio. Having the ground fused is a cheap way to protect your expensive radio.

Ahh here it is:

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Originally Posted by cruiserlarry
The reason you fuse the ground wire on sensitive electronics is to prevent a current overload from another higher powered circuit from back-feeding into the radio and damaging the radio's electronics.

Example: Your vehicle's battery ground cable gets corroded or has a bad connection for whatever reason (Things loosening up off-road - very common). The starting circuit draws a lot of current (hundreds of amps) - way more than the radio can handle. If the battery ground is not effective, the current will find the path of least resistance - right through the radio's ground wire and through the radio's circuits. This would destroy the radio in an instant, without ever blowing the fuse on the positive power wire to the radio. So, if the negative lead is fused, the fuse will blow before the large current surge can get to the radio's electronics and reek havoc.
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Unread 10-02-2013, 08:55 AM   #8
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Nice! Thanks for the informative info. I gotta go grab a fuse holder. I hate glass fuses. I prefer the blade fuse.

Now, is there a reason to choose one type of fuse over another? LoL


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Unread 10-02-2013, 10:34 AM   #9
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Nice! Thanks for the informative info. I gotta go grab a fuse holder. I hate glass fuses. I prefer the blade fuse.

Now, is there a reason to choose one type of fuse over another? LoL


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I kept the dual glass fuses on my 350R, which is powered through my Blue Sea fuse box. I didn't feel like redoing the fuses since it was already done at the factory for me by Yaesu. They chose to use glass fuses for whatever reason and I just stayed with it. No need to fix, what's not broken.


For the biblical length nerd answer to which fuse type is better than the other.......there's a great invention.....called "Google". :p


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Unread 10-02-2013, 11:28 AM   #10
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For the biblical length nerd answer to which fuse type is better than the other.......there's a great invention.....called "Google". :p


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My teacher once told me to never trust the internet. To learn is to ask questions or to get my butt off the couch and walk to the library... I haven't been to a library for over a decade. Plus if I use google to search for the closest library, it might lead me to a brothel where the madam might kidnap me and make me her sex slave. I have a girlfriend. I can't do that to her. I am uber faithful. So that is why I go on 120 to ask my Elmers multiple questions. ;P

But cool beans. I too got the blue sea fuse box hard wired into the cab for all my electronic goodies.


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Unread 10-02-2013, 12:24 PM   #11
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My teacher once told me to never trust the internet. To learn is to ask questions or to get my butt off the couch and walk to the library... I haven't been to a library for over a decade. Plus if I use google to search for the closest library, it might lead me to a brothel where the madam might kidnap me and make me her sex slave. I have a girlfriend. I can't do that to her. I am uber faithful. So that is why I go on 120 to ask my Elmers multiple questions. ;P

But cool beans. I too got the blue sea fuse box hard wired into the cab for all my electronic goodies.


Farted a rainbow and this message was sent.


Sorry I couldn't answer your question......My interests are elsewhere now. Elmer Jack or some other Elmer could probably give you the yearbook answer when they get a chance.

I'm not involved or highly interested in the HAM world as I used to be a few years ago......It's not a job......it's just another hobby to play with.
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Unread 10-02-2013, 06:55 PM   #12
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Now, is there a reason to choose one type of fuse over another?
The blade type are smaller, less likely to break, easier to determine if blown some times with the glass ones it's not always obvious.

Colourful thread BTW
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Unread 10-02-2013, 08:17 PM   #13
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Heh heh. But a useful thread for all the newbie HAM operators on here, if they're curious about the extra fuse.

oh btw, Jon, I installed the radio today. LoL. I still need your help one day on helping me understand what all these features are. You can also help me connect my gps to the radio. I think I just need to pick up a data cable.


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Unread 10-02-2013, 11:14 PM   #14
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EJ here... Fuse on both ends brah

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