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Thread: Car Computer Install: Power Structure

  1. #11
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    Yea we used 8 gauge wire for the positive run to the trunk and another 8 gauge for the negative. In the troubleshooting video we go over using ground loop isolators as well as scratching back paint on the chasis to try to make a good ground connection.

    But yea for new users, if you *can* go back to the battery for ground its *usually* the best fix.

  2. #12
    Raw Wave
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    Sorry - this is a bit late, but...
    Quote Originally Posted by soundman98 View Post
    audio competition rules state that all power wires MUST be fused within 18" of the battery...
    Ah - that is one source for that rule!

    IMO there can be no such rule in general...
    In some applications, fusing is dangerous (eg, high current DC systems; usually above 3,000A), and I have seen several instances where adding fuses (especially within 12" or 18") has INCREASED the hazard risk!


    IMO the rule should be that adequate protection is provided.
    Protection is usually via 2 means - "physical" (as with the starter-motor wire that is almost always un-fused (in typical and non-modified situations) yet it carries typically a few hundred Amps) and (2) "fusing" (including circuit breakers, or temperature or current-sensing trips etc).

    The fusing "within x" of a battery" should be read as "as close as practicable to the battery" (without itself causing a hazard). (FYI - in some applications, fusing is NOT allowed in the same room or compartment as the batteries.)


    Many installations do not have fusing and are considered quite safe - eg, dual batteries in engine bays where the interconnection is a copious gauge heavy insulated wire, maybe through additional insulation like garden-hose or a plastic-tube, else additional physical protection (metal conduit to prevent insulation crush in accidents etc).

    As to certain car-competition rules that allow battery isolation switches to be in the hot (+ve) battery circuit with the isolator switch in the cabin - or worse, a remote rear corner - ah well, that's their funeral. As to those that mandate that situation (eg, if the isolator also has to kill the engine)... IMO stupid and risky. (Battery ground isolation is what should be used, but this won't kill an engine. But IMO "engine kill" and "battery isolation" are two separate requirements. They can be interlocked, but that requires complexity that stretches reliability etc.)
    [ By isolation switch I man a full-current carrying switch - not a switch that control remote relay(s) - but they have reliability and hence other safety issues too. ]


    Sorry for this delayed reply -cum- hijack. But if enough people understand the issues, maybe one day the Rules will be modified appropriately. (Alas I recall when certain scrutineers claimed that ground isolation was illegal! Related regulations/rules have since been notated (or changed) to allow the far safer ground isolation.)
    Last edited by OldSpark; 08-29-2011 at 02:14 AM.

  3. #13
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    YouTube.......

    Not sure what format you guys are shooting these videos in, but it would be nice to have them available on YouTube. Any reason they aren't? I'm having a hard time viewing some on my xoom tablet.

  4. #14
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    thank you for you sharing.

  5. #15
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    Signal wiring question

    I have basically copied your build and have a question on the signal wiring. I was reading the manual for the power supply (imagine that..lol) and noticed they have a spot to send the signal wiring to the amp(s). It also stated that this helps the "pop" that some people experience. Do you suggest not using that feature of the power supply? If so, could you explain the reasoning?

    Thanks for the videos too!!!

    JM

  6. #16
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    What page of the manual talks about that? I can check it out for you. I'm not aware off the top of my head though. Ha.

    Quote Originally Posted by intocad View Post
    I have basically copied your build and have a question on the signal wiring. I was reading the manual for the power supply (imagine that..lol) and noticed they have a spot to send the signal wiring to the amp(s). It also stated that this helps the "pop" that some people experience. Do you suggest not using that feature of the power supply? If so, could you explain the reasoning?

    Thanks for the videos too!!!

    JM

  7. #17
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    Here is what was I found....

    Name:  M2-ATX  Remote Support.png
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  8. #18
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    i suggest trying the it without it first. not all systems have turn on pops, and it is one less thing to get in the way of the amps turning on.

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