If the computer is moden then use 5 amp and if the computer is older and smaller then use a 3 amp
The Fuse size is listed on the under side of the Fuse Cover.
I need to change the fuse on the horn and hazzard lights on 1990 toyota pickup, what amp should I use?
Positively not. Never ever use a different size fuse in a circuit. The fuse is there to protect the wiring in the circuit from overheating and catching on fire.
Use a 20 amp fuse or breaker.
The fuse you use is determined by the load on the circuit and the size wiring used in that circuit not the battery voltage.
15 amp
On a fault condition of the circuit, the current most likely will not be removed. If this happens components in the circuit will most likely act as a fuse and will components will be completely destroyed. This is why the manufacturer recommends what size of fuse to use in their equipment and this fuse size should always be used.
The fuse rating it 15 Amps and the size is 3AG..can be accessed by unscrewing the tip of the plug in connector.
20Amp
Usually nothing larger than 3 amp fuse. Under normal use 2amp fuse will work perfectly....
Use the exact same size, shape and color fuse as the blown out one you removed from the fuse box
Turn off the fuse box.