Anyone know the capacity of the ignition switch? I saw several posts about burning up your ignition switch when upgrading lighting cant remember if it is headlamps or passing lamps...but cant find the threads....anyone familiar?

Thanks guys

 

You don't run the lighting thru the switch. You can power a relay thru the switch and run the power to the lights thru the relay. the relay will take all the amperage, and the switch only has a very small amount of current running the relay, Milliamp stuff

 

So P&A runs through ignition switch and is good for 15A. If I connect lighting to the P&A fuse via accessory wiring shouldn't I be ok if I stay under 15A or am I missing something. I am looking at the lighting relay and it feeds two 15A runs.

Thanks Charlie!

 

Yes, run power to the relay from the switch. Then run direct batt current to the relay, so when the relay is energized it will put the direct batt power thru the relay, and run that power to your lights. You could even place a switch in the circuit, if desired so you can turn ignition power on and off, that way the lights don't always have to be on. Let the relay carry the amp draw. make sure the relay is at least a 30 amp relay, if you are running some high powered lights. the other thing, might be using a LED bulb, and that keeps amp draw down considerably.

 

I don't see what year and model your working on.

What is the expected amp draw for the lights? Any idea what your current amp draw is now with every thing on? Last what is your stator rated at?

 

if I remember correctly, in the newer bikes the ignition switch just turns on the computer and that turns on the accessories (thru a relay?) - so adding lights won't affect the switch. Just stay within the limits of the P&A or lighting circuits.

 

2011 Road King. From what I can tell in my electrical manual the P&A power (NOT the Accessories power that runs all the other little lights and horn) supplies the accessories outlet under my seat and has a dedicated 15a fuse...nothing else gets power from P&A as far as I can tell. Both P&A and Accessories run through the ignition switch. I pulled the orange and red wire from the connector that goes to the left toggle switch and swapped it with the yellow wire that provides power to the right toggle switch. So now the passing lamps are powered by the P&A power, the accessories outlet under the seat is powered by the headlamp low beam power. I did this so I can run the passing lamps when the high beam is on and I don't really use the accessories outlet. My thought is that if I keep the passing lamps below the P&A 15a fuse requirement I should be ok thinking MOCO designed for the P&A outlet to run 15a through the ignition switch. I was just going to put some 37.5w bulbs in the passing lamps which is a little over 6amps. Hopefully this all makes sense...there is a lot I don't know about how these electrical components work. I want to thank all of you for giving me your time to help me out. Here is a picture of the diagram with a couple of black arrows.

 

I had the Dealer flash the ECM so the passing lights stay on when the high beams on. Give them a call and see if it will work on your bike.

 

Do you have CANBUS?

 

Yes, sorry

How about this:
http://www.harley-davidson.com/store...re-harness-kit