Vendome 41
Registered user
What size fuses can I use safely on auxiliary lighting.
Fuses / Amp rating
- Thread starter Vendome 41
- Start date
Depends on the cable you're going to use and it's rating. Todays top tip, use a fuse of a lesser amperage than that of the cable. 
And the cable size should depend on what lights you're going to use.
And the cable size should depend on what lights you're going to use.
You can work out the current draw of the total load using the equation
W (total power watts) divided by V (voltage) = Amps (current draw).
Example 2x55 W lights divided by 12 V is 110/12 which equals 9 and a bit Amps.A 10 amp fuse may blow too easily,so use a 12 or 15 Amp one.
And,has already been said,use at least 15 Amp wire preferably 20.
STUBBS
undead
mine have 15a ones
Of equal importance is where are you breaking into the electrical circuit. If it's directly to the battery the above applies, if it's into an existing circuit you need to trace that and establsih the rating prior to doing anything else.
Global Rider
Guest
They're usually a 15A fuse. My Hella relay incorporates a 15A fuse to drive 2 x 55W lights.
Wire gauge is chosen based on length and current. Just because your battery voltage may be 13.5V while underway, doesn't mean you are seeing 13.5 volts at the load. Wire has resistance, so choose a guage to minimize voltage drop...usually 14 ga or better still, 12 ga. Ideally, you want battery voltage at your lights, not 0.5 volts less due to voltage drop cause by wire resistance.
Ever wonder why a 2 ga battery booster cable is better than an 8 ga battery booster cable for starting a car with a dead battery?
no no no the symbol for voltage is no longer v it is now u
we are now in line with our euro couisins
after 23 years of thinking v=ir now it is u=ir
i hate change
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