Miguels Posted December 13, 2014 Report Share Posted December 13, 2014 You are confusing circuit ground, chassis ground, and earth ground. An automobile is isolated from "earth ground" by the rubber tires, but the 12V battery negative terminal is connected to the car chassis forming the "chassis ground". The circuitry in the car is also grounded to the chassis, albeit with some other protection in between, but this has nothing to do with the current flowing from one car to another during a "jump." If anything, this circuitry can be destroyed from spikes in the battery voltage. "Ground" is just a code word which, in this case, refers to the "current return common" circuit node. There is a complete circuit because everything electrical in the car, such as the starter motor, also connects to ground in order to return current to the minus terminal of the battery through the ground. The car's chassis is used for this return network, and so the entire chassis is an extension of the minus terminal of the battery. the frame needs the battery to be ground without the battery the frame is not ground. there for the negative on the battery is ground my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
alaskanzx5 Posted December 13, 2014 Report Share Posted December 13, 2014 ^ failed. I'll find a link if info from snafu t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
Broke_Audio_Addict Posted December 13, 2014 Report Share Posted December 13, 2014 ^ failed. I'll find a link if info from snafu Oh you think so?Do me a favor go unhook the negative battery terminal and tell me how well all your electronics that are connected to that "chassis ground" still function. That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals. Link to comment Share on other sites More sharing options...
Smoove Posted December 13, 2014 Report Share Posted December 13, 2014 i got this info from snafu Now, think for a second about where your amps are grounded. Now, think about the return path between the amps and the alternator - what exactly does that look like? Simple - amp to chassis . . . chassis to battery negative . . . battery negative to engine block . . . engine block to cylinder head . . . cylinder head to alternator bracket . . . alternator bracket to alternator. Hey, aren't there gaskets between the cylinder head and block? Are those stock cables big enough? Snafu is full of great info. Nice guy, both times I went to his house to pick up stuff I could have stayed and talked car audio tech for hours. 2 Team Fi 15's v1 2 DD M5's 970amps of Alt 6th order blowthroughThe truck Blowthrough build : http://www.stevemeadedesigns.com/board/topic/155555-smooves-1996-chevy-ext-cab-c1500-slow-build/The 350z build : http://www.stevemeadedesigns.com/board/topic/170694-smooves-2003-nissan-350z/ My FB page https://www.facebook.com/pages/Smooves-Car-Audio-and-performance/719746144805343 Team Fi Audio http://www.ficaraudio.com/ Link to comment Share on other sites More sharing options...
Miguels Posted December 13, 2014 Report Share Posted December 13, 2014 the chassis is gound only after the battery is connected to it.. remove the negative on the battery and touch your power wire to the chassis.. do you get sparks? no. its not grounded to the battery.. the problem is Tony gives you the right information and you guys twist it.. chassis is ground but it needs the battery.. as a matter a fact. dont ground your chassis and ground your engine. i bet you wont have any issues starting the car but good luck running amps that way my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
Miguels Posted December 13, 2014 Report Share Posted December 13, 2014 the reason you run wires from bat to chassis is because you ground your amps to the chassis. you can get same benefit without using the frame. you will just need lots of wire to get ground from the front battery to the rear amps.. how do you think owners of cars who have no chassis do it? my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
alaskanzx5 Posted December 13, 2014 Report Share Posted December 13, 2014 http://www.stevemeadedesigns.com/board/topic/155754-charging-systems-101-video-on-page-3/ Right here, he proves that the alt case is ground while the car runs. Not the battery ground.. Its a "return path" it must return where it starts. It starts where voltage is at its highest. A battery rests at 12.2-13.1 pending battery quality and type. An alt charges above that. Meaning the power source is the alt and it "returns" to the starting point. The chassis or frame is never ground. Its just the path it uses to get to ground. This could be through a neg run, the chasis, a direct neg run to the alt or through the battery ground to a alt ground wire to the alt. It will use the path of least resistance. As we all know. Oh and power actually travels from negative to positive. t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
Miguels Posted December 13, 2014 Report Share Posted December 13, 2014 well no shit the alternator case is the ground.. the argument here is the chassis. the chassis is not ground until the battery or alternator is wired directly to it.. you can build and wire your car without even using the chassis.. it will take lots of wire and not cost efficient so the chassis is used as a bridge/shortcut my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
alaskanzx5 Posted December 13, 2014 Report Share Posted December 13, 2014 I see no one here mention the chassis as ground. Just the battery and alt. I see the chassis mentioned Sa return path. Maybe I missed something. Fyi The chassis is not ground even when the alt or battery is connected. It's just a path never a ground. Point being With an alternator that can fully supply the electrical needs of your vehicle and it's "extras" then its is ground. If voltage across enough for the battery to pitch in then the battery neg post becomes ground. t1500bdcp 2 t2d4 15" 1 t600.4 1 t400.2 1 set p1 tweets singer alt, tons of wiring, smd vm-1, 80prs, back seat delete, still in the works, aiming for a 145-147 with the ability to play 25hz up to 50hz. Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 13, 2014 Report Share Posted December 13, 2014 well no shit the alternator case is the ground.. the argument here is the chassis. the chassis is not ground until the battery or alternator is wired directly to it.. you can build and wire your car without even using the chassis.. it will take lots of wire and not cost efficient so the chassis is used as a bridge/shortcut You said battery negative is ground, and I said no it isn't. http://www.stevemeadedesigns.com/board/topic/171708-fact-and-science-have-no-place-in-car-audio/ Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
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