Re: New fog lamps blowing fuse - Saab 9000 Bulletin Board - Saabnet.com
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Re: New fog lamps blowing fuse
Posted by BobS (more from BobS) on Sun, 16 Mar 2003 12:00:56
In Reply to: New fog lamps blowing fuse, Rod'899kT, Sat, 15 Mar 2003 21:42:21
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A 15 amp fuse is really to small even though the math says it should work. A fuse 1.5 times the load rating is reasonable depending on the type load. The fuse is to protect the circuit from smoking in case of a short. Therefore the wire size, relay capacity, etc must be be capable of handling the fusing current of the fuse. Lamps have a high inrush current when turned on due to the low resistance of the filiment when cold. Measure the resistance of your lamps and then do the math to determine max inrush current. You will be surprised. So it's a race between when the fuse blows and the lamp lights up and reaches it's rated wattage.
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