Headlight relay question
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
If they are rated at 20 amps or more they will be fine. Just determine which are the contacts, for the power to go through to the lights from the battery. The other two will be the coil, one side gets the signal from the switch and the other side goes to ground.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Fifteen amps is fine.
Volts X amps = Watts
Take the wattage of the headlamps (I'll use 55watts as an example.)
Divide the headlight wattage by the volts. 12v
55w divided by 12v equals 4.6 amps. Times two bulbs is just under 10 amps.
The filiments draw more when cold, but that is only for an instant but it has to be allowed for. So yes, a fifteen amp fuse is good.
Volts X amps = Watts
Take the wattage of the headlamps (I'll use 55watts as an example.)
Divide the headlight wattage by the volts. 12v
55w divided by 12v equals 4.6 amps. Times two bulbs is just under 10 amps.
The filiments draw more when cold, but that is only for an instant but it has to be allowed for. So yes, a fifteen amp fuse is good.
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