02 FXDWG.
Riding along I heard what sounded like a backfire and lost all power. Disconnected the regulator. Nothing. Bypassed the ignition switch. Nothing. Ideas?

 

Is all power gone? No lights, no dash, nothing?
2002 has a main breaker? Have you checked that? Not sure why you disconnected the regulator. Have you put a meter on the ignition switch? Is power getting to it?

Obviously first thing to do check battery cables are tight. Then put a meter on the battery. Have you tried a jump pack? Have you put a charger on it, on high just to see if anything happens?

Do you know the battery is good? It can read votlage, and still be bad, but I would put a meter on it.

 

Trace the circuits with a volt/ohms meter to either find a shorted or open circuit. It takes the guesswork out of the problem.

 

NADA.
Checking breaker tomorrow.
Wanted to eliminate charging circuit.

 

If you discover your battery went dead because it wasn't being charged, that would be something to check. But you would check output,

First thing to do is see where you got power and where you fdon't. Battery should have power. If it doesn't charge it, put a good battery in, or jump pack.

No point checking breaker if you don't even know if you have any power

 

if you own a DVM, check battery voltage, if 12V check main fuse and breaker, also check that chase ground from battery is tight

 

Been there, done that. Check the ignition coil.

 

Do not check the coil. He has no power.

 

Before you go on a wild goose chase, charge the battery and have it load tested. If the battery is more than three years old I would not trust it (even though there are some who think they last 10 years).

Remove the battery cables, clean the terminals and the surfaces they contact.

Clean the terminals and contact surfaces on the wire that goes between the main breaker (copper stud) and the starter.

Clean the terminal on the wire at the silver stud on the main breaker.

Read voltage at copper stud on main breaker.

Read voltage at silver stud on main breaker.

Unplug the connector on the ignition switch, read the voltage for the red wire.

What are the voltages?

 

Start at the source and work your way from there, all power comes from the battery so check voltage there. Then check voltage at the other end of the cable at the starter, then the main fuse, ignition switch, etc. Once you find no voltage where there should be the problem is in between there and the previous place you had voltage (open circuit).