Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
Re: Damn those batteries
I once thought I had a PC680 going bad, replaced it, then found I had a problem with the wire from the dash alternator light to the back of the alternator issue. The connection on the back of the alternator was loose, and sometimes made contact, other times not. I was riding around with the battery sometimes charging, sometimes not.
After fixing this, no problems.
I did learn this: ALWAYS CHECK THE ALTERNATOR LIGHT ON THE DASH WHEN TURNING ON THE IGNITION, BEFORE STARTING THE ENGINE! If it is not on, then the alternator may or may not charge the battery when the engine is started!
The LT alternator is an "externally excited" type, and needs the small current through the dash bulb to initiate charging once the engine is started. There are no permanent magnets in this type of alternator, so the small current is needed to "boot" the alternator when started. There may or may not be enough residual magnetism in the rotor to do this without the light circuit working, but usually not.
By the way, I had a garden tractor in which the battery died, the old PC680 I took out of the LT had been sitting on my garage floor for about 6 months, just for the heck of it I put it in the tractor, and it started better than ever! Three years later when sold the tractor it still had the PC680 in it.
I don't want to achieve immortality through my work...I want to achieve it through not dying.
EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
No bike now, but maybe in the future.