New Battery Not Holding A Charge
- Thread starter Shelby6t7
- Start date
My 2002 Fatboy had the regulator & battery replaced less than 2 years ago.Ever since the battery does not hold a charge even after being charged on a battery tender and ridin for a while. I haven't even been activating the factory alarm? Any theories?
Do the bleed-back test to make sure that the VR is not shot.
Testing The Charging System - Harley Davidson Community
TQ
Chopper
Senior Member
You can also do a Milliampere Draw Test
NOTE
Be sure accessories are not wired so they stay on at all
times. This condition could drain battery completely if vehicle
is parked for a long time. Check for this by connecting ammeter
between negative battery terminal and battery.
1. Connect ammeter between negative
battery terminal and battery. With this arrangement, you
will also pick up any regulator drain.
2. With ignition key switch turned to OFF and all lights and
accessories off, observe amperage reading.
a. Add regulator draw to appropriate
value for TSM/TSSM/ECM. If sum is less than reading
observed on ammeter, draw is within limits.
b. A higher reading indicates excessive current draw.
Any accessories must be considered and checked
for excessive drain.
NOTE
A battery with a surface discharge condition could suffer a
static drain. Correct by cleaning battery case.
Milliampere Draw Test
ITEM MILLIAMPERES DRAW
Regulator 0.5
TSM (non security models) 0.5
TSSM (disarmed) 0.5
TSSM (armed) 3.0
ECM (EFI models) 1.0
NOTE
Be sure accessories are not wired so they stay on at all
times. This condition could drain battery completely if vehicle
is parked for a long time. Check for this by connecting ammeter
between negative battery terminal and battery.
1. Connect ammeter between negative
battery terminal and battery. With this arrangement, you
will also pick up any regulator drain.
2. With ignition key switch turned to OFF and all lights and
accessories off, observe amperage reading.
a. Add regulator draw to appropriate
value for TSM/TSSM/ECM. If sum is less than reading
observed on ammeter, draw is within limits.
b. A higher reading indicates excessive current draw.
Any accessories must be considered and checked
for excessive drain.
NOTE
A battery with a surface discharge condition could suffer a
static drain. Correct by cleaning battery case.
Milliampere Draw Test
ITEM MILLIAMPERES DRAW
Regulator 0.5
TSM (non security models) 0.5
TSSM (disarmed) 0.5
TSSM (armed) 3.0
ECM (EFI models) 1.0
J
Jack Klarich
Guest
Also check to see that the regulator is grounded, connect a test light to the pos. on the battery and touch he regulator and the frame it bolts to, if the test light lights up you have a ground, Jack