ok 2004 lowrider fi on way home from the sonny barger reunion run in cave creek az the other night on freeway funnin 80-85 and all sudden all power goes off for like 1 sec comes back on for maybe 2 sec then goes off again coast to side of the road stop turn key off then back on and nothing absolutely nothing call wife she comes with trailer and we go home next day come out turn key to acc lights come on turn key to run position and push start button and not even a click all power goes off so i check the battery reads 12.9 turn key back on try and start again soon as hit button lose allpower did it again with the volt meter on battery and when i push the start button it goes down to 8.9volts turn key off and battery shows 12.9 all connections tight and clean, now sometimes turn the key to acc gauge lights come on but when turn key to the run position nothing lose all power???????????
Please anyone have any clue?
Thanks
Paul

 

Sounds like you might have a charging problem or fused cells in your battery. Normally that large of a voltage drop would point to fused cells.

Do you have another battery to try? Also, check all your battery connections and your grounds. It might just be a loose connection, it happens.

 

+1 check grounds and wires for breaks/shorts or damage where the insulation may have worn through

 

Sounds like a bad battery to me. If you are checking the voltage at the battery terminals and it goes that low under the starter load it is definitely bad (based on a very good idle voltage of 12.9V)

 

and by the way, all of your fuel injection components that rely on voltage differences will be affected. This affects things like throttle position sensors and MAP sensors and could definitely keep the bike from running too even if it would start but I think it seems as if nothing is working for you, not even a light or horn. I still say battery is shot.

 

Check all your battery connections, check where the cables are connected on both ends. Sounds like a loose ground connection. Charging system should be fine if you are still reading voltage on the battery.

 

right nothing is working well turn key to acc and gauge lights will come on and then turn to the start position and nothing fused cells huh? battery is about 8 months old just crazy how the voltage will drop so low when the start button is pushed and it doesnt even atempt to try and turn over at all everything just goes off but then check the battery at the bat terminals with volt meter and it will read 12.7 or 12.8 i hate elec problems lol and the laughlin river run is this weekend lol

 

okay so tell me is it possible this could be caused by the system relay?

 

same thing happened to me- was the ignition switch... have it checked

 

ign switch? as in switch with key?