Bike wont run after washing it

Did you wash it with the seat off? Sounds like you got the relay wet, or fusebox wet.... take the seat off, let the bike set in the sun for a couple of hours....hopefully whatever you got wet will dry out and the bike will start.

spray all your electricals with silicon spray. sparkplug wires, cdi unit, ign. wires etc. that will keep stuff from folowing wetness

Sounds like you need a new radiator if it is leaking or a head gasket if it is blowing out of the pressure cap.

Replace the bulbs.

have you checked for a spark at the plugs. You may well have got water in the coils.The cure for this is natural drying. if this is the case the coils will need to be sealed. and the leads silicone sprayed

try looking at the fuse box . i had this problem with a customers bike and the fuse box had a crack in the pc bord that is under the fuses

98 honda shadow ace wont start electric switch is sticking and the headlight doesnt come on when key is turned on

hi m8,, first try this, take the handle bar start button switch gear appart,,and clean the starter button terminals that connect wen u push button in,,spray some wd40 inside the switch gear wen u put it back together,,,,,often after off roading ,,connections that the eye cant see corrode wen the bike is washed down,, any probs still ,, shout and il anserw m8,,,,,cheers