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Thread: Wiring from battery and switch questions

  1. #31
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    The GMC doc has 2 inline fues. The devices will already have at least 1 fuse in them, 2 in the case of 2 way radio's. So The documents show 4 (or 3) fuses. 2 at the battery one on each wire.
    and 2 (or 1) on the device itself. I never suggested putting a fuse on the negative lead of the battery going to the chassie. I always suggested dual fusing any wire you run to the battery. Leave the factory wires alone. You fuse on both sides of the firewall.


    SO, Since I own a GMC vehicle and have an Icom radio. Ill follow there recomendation. 2 fues at the battery and 2 fues in the radio for a total of 4 fuses.

    With that in mind I should be able to summons the fire dept when the miswired amps in your vehicles cause a fire...


    If your happy with the safety of 1, 2 or no fues then wire it as you like. If factory recomendations dont convice you then I sure am not going to do it.


    Power comming into my radio gear and (to the topic) MP3 gear will be double fused ( actually ill be using circuit breakers) on both leads.


    Subject is close from my standpoint..

  2. #32
    Retired Admin Aaron Cake's Avatar
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    None of my 3 RX-7s have fuses on the negative lead. My mom's Oldsmobile doesn't have a fuse on the negative lead. My dad's Spirit doesn't have a fuse on the negative lead. My neighbours Porsche doesn't have a fuse on the negative lead. Neither does any GM or Ford that I have ever seen.

    Fuses on the negative in an automotive situation are completely pointless, and simply add another point of possible failure. Perhaps newer vehicles come with them for two reasons:

    1. Increase cost
    2. Fear of being sued

    It is entirely possible, though I have never seen a fuse on the negative in practice. It's pointless. All you need is a main fuse (or fuseable link) at the battery, a fuse at your fuse box, and then one at your device (which again, is required by CSA or whatever organization governs your countrie's codes).

    Amateur radio, though, is a completely different story. In that case, fusing the negative makes sense.

    Even running a ground straight to the battery doesn't require a fuse, since if it shorts, it's just going to ground anyway. And if it shorts to +, then the fuse (fuses) protecting the + circuit will blow anyway. In fact, I can think of several circumstances where having a fuse on the negative could CAUSE fires (think excessive heat caused by high resistance fuses in a short situation, mismatched fuses, etc.).

    Either way, I think the whole point is that you need two fuses; one at the battery, one in the car. This assumes that your device has a fuse as well. So really, there are three.
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  3. #33
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    Originally posted by Ohgary
    The GMC doc has 2 inline fues. The devices will already have at least 1 fuse in them, 2 in the case of 2 way radio's. So The documents show 4 (or 3) fuses. 2 at the battery one on each wire. and 2 (or 1) on the device itself.

    SNIP

    Power comming into my radio gear and (to the topic) MP3 gear will be double fused ( actually ill be using circuit breakers) on both leads.

    Subject is close from my standpoint..
    Wow,
    Now you are counting fuses internal to the component?

    (The devices will already have at least 1 fuse in them, 2 in the case of 2 way radio's. )

    Changing your story as needed is not the best way to win friends or influence perceptions.

    No I do not think the Mod. is always right because of the Mod. role, However I have never seen Aaron make wiring mistakes or provide bad advise.

    It is OK with me for you to be wrong and convinced otherwise. It is also OK with me that you say the "Subject is close from my standpoint.. "

    Good luck with your wire project, and as far as Calling the Fire Dept.

    Has anyone even blown a fuse on their system?
    Any Fires in MP3 cars?

    No on both for me, Yes I know small sample and maybe I just have not been running long enough..... Hee Hee almost 4 years now.

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  4. #34
    Unregistered User ODYSSEY's Avatar
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    What is the number for 911?

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  5. #35
    Raw Wave Rob Withey's Avatar
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    Originally posted by TruckinMP3
    Has anyone even blown a fuse on their system?
    Any Fires in MP3 cars?
    Yeah, I did. I hooked up the + and - the wrong way round one time (oops), and the fuse saved my power supply and motherboard. No fires yet though, but I'm working on it.


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  6. #36
    Retired Admin Aaron Cake's Avatar
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    I have blown a fuse as well. My reset button is mounted to a lexan panel epoxied over a hole in the dash (looks better than it sounds). I pushed the reset button way too hard, which puched the panel into the dash breaking the epoxy. The button shorted on some internal metal. Really glad that I fused....
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  7. #37
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    Okay, maybe a better question is : has anyone had an instance where one fuse would not have been enough and they had to use more than one fuse instead?

    Aaron, did you fuse the reset button itself? Seems to me like there shouldn't be nearly enough current to go through a reset button before something internally to the mobo breaks to blow a fuse...?
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  8. #38
    Retired Admin Aaron Cake's Avatar
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    The way my system is set up is a little different. The reset is connected to a small reed relay, which triggers with +12V. The reset button in the dash supplies +12V to trigger the relay. This is much better than connecting the actual reset header on the motherboard to a long wire going to the dash for several reasons. My power switch is actually the same, with simply a much larger relay connected in series with +12V and the DC-DC.

    Anyway, the 12V for the reset switch comes off of my distro box, and has an inline fuse of 1A. This also supplies the power switch.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
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    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."

  9. #39
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    Im running with no fuses, lol *SMACK*, i just haven't gotten around to puttin the fuses in yet, bad idea since i don't have the wore going through the firewall, it goes under my car. im asking for trouble

  10. #40
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    Well, on a raod trip this weekend I blew a fuse. Real bummer ;-)

    A loose spring from my passenger seat caused the short. Oddly the fuse on the positive side of the circut did its job!

    After removing the short and replacing the fuse all is well.
    Look Ma no FIRE :-0 due to a lack of - side fuses. I wonder how that happened ;-)

    TruckinMP3
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