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min wire size for battery +12v supply

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specs 
Copper - Posts: 120
Copper spacespace
Joined: October 02, 2009
Location: Saskatchewan, Canada
Posted: December 10, 2012 at 8:33 PM / IP Logged  

If I'm running a wire directly from the battery for the +12 volt supply to a remote start/bypass install, is there a rule of thumb about what guage wire to use? Supplying two feeds to the r/s unit and a single to the bypass.....r/s 12V inputs are fused at 30A, should I be using a further fuse inline from the battery and, if so, what rating?  Thanks, Al

auto enhancers 
Copper - Posts: 203
Copper spacespace
Joined: April 09, 2012
Location: Indiana, United States
Posted: December 10, 2012 at 10:30 PM / IP Logged  
Year make model of vehicle. How long if a wire run?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 11, 2012 at 12:12 AM / IP Logged  
Vehicle dependant? I almost NEVER go to the battery.
Most don't have enough wire length.
On most cars the ignition switch and or fuse box supply leads are sufficient.
specs 
Copper - Posts: 120
Copper spacespace
Joined: October 02, 2009
Location: Saskatchewan, Canada
Posted: December 11, 2012 at 8:35 AM / IP Logged  
Sorry guys....vehicle is a 2004 Chevy Colorado, just thought it was better to run a direct power supply instead of multiple connections at the ignition switch or fusebox...thx, Al
soundnsecurity 
Gold - Posts: 2,711
Gold spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: November 10, 2008
Location: Louisiana, United States
Posted: December 11, 2012 at 9:34 AM / IP Logged  
im not sure if the wires at your ignition harness are thick wires or thin wires, but if they are thick then you dont need to run any wire to the battery. if they are thin wires at the ignition harness then you need to go to the battery but you shouldnt need anything thicker than 14 gauge or 12 gauge if the wire is low quality.
definitely add a fuse on that wire close to the battery.
specs 
Copper - Posts: 120
Copper spacespace
Joined: October 02, 2009
Location: Saskatchewan, Canada
Posted: December 11, 2012 at 12:51 PM / IP Logged  
Thks sound, much appreciated! Al

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