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Constant wires, amps?

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=82599
Printed Date: July 05, 2025 at 5:58 AM


Topic: Constant wires, amps?

Posted By: black cavy
Subject: Constant wires, amps?
Date Posted: September 07, 2006 at 6:47 PM

I've notiched on the ref sheets that Gm and alot of others state12v constant(20A)(30A)(40A)

Does this mean that the wire your contect to it has to stay below the rated amps,if that makes sense.

or should you use a realy  or some sort




Replies:

Posted By: sparkie
Date Posted: September 07, 2006 at 7:53 PM
I think what you are referring to is that the circuit is fused at that rating. They are fused to a particular limit based on what devices they supply power to and what the total current draw would be if all were using their maximum current. Typically circuits fuse above 20 amps are for large power consuming devices such as power windows, rear defoggers, amplifiers. The 40 amp and up circuits usually are fuses for entire circuits like everything on the accessory or igntion circuit and are underhood close to the battery. They will supply power to other fuse boxes which split the power into smaller fused cicuits.

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sparky


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