How to wire in auxiliary fog lights on your motorcycle when you’re not supposed to.

There will be a point in time when you will want to add something electrical onto your motorcycle but the manufacturer seemingly hasn’t made it easy for you to connect it to your bike’s electrical system.

Be it heated grips, fog lights, air horn or some 80’s revival boom box that will undoubtedly blow the skirts of young ladies as well as attract disapproving scowls from the neighbours too…at some point you may wish to add them…but how.

Depending on your motorcycle age and the simplicity of it…or rather how confusing and complicated it all is, will largely determine how easy it is to do.

First thing to do is do some research first of all…and I’m not talking about how cool looking the item is that you want to fit to your bike. I’m actually talking about the boring stuff like wiring routes, switches, relays, power demand and draw and ultimately whether your motorcycle battery and charging system will be able to handle the extra electrical drain.

Some motorcycles will have hidden within the wiring loom, an accessory power port which you may be able to connect to, and others may have nothing at all. Some motorcycles will not allow anything to be connected to it unless there is a specific procedure in place that does not interfere with the onboard computer…or even it must be reprogrammed to accept the addition.

Possible the safest way to add electrical accessories is to gain a power and ground supply direct from the battery, include a separate in line fuse, use a relay and separate switch which you’ll have to mount either on the handlebars or about the chassis somewhere.

The only problem with this method is that sometimes the wiring set up, whilst functional does look rather untidy, so great care and planning should be made to make it look as good as possible. However there is another big issue too…the risk of draining the battery.

However you choose to power the item, there are effectively two main ways of achieving it. Either a direct feed from the battery to a switch or via the ignition.
The latter is always preferred because there is less risk to draining the battery when the engine is not running, whilst the former is prone to accidentally leaving the power on or some little oik maliciously pressing it on which drains your battery and you’re left stranded.

If you’re unsure what to do, then simply ask your local bike shop to see if they can offer any advice or if your in any local bike groups then start asking around. Try online sources and youtube of course, but remember sometimes key information is glossed over or omitted from these sources and it’s not exactly clear how a task should be done.

But simply put always remember how much power your device needs and will your motorcycle be able to cope with supplying it. Choose the power supply and routing method, then try to make it look as good as you can.

Good Luck!

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