Join Date: Dec 2004
Location: Bedford Hts, OH, USA
Re: Why Error Light on BMW Charger Comes On
Are you sure its an error? Is it solid red or flashing red? Do you have a meter to see if it charging? The BMW charger will shut down to protect itself if it dosesn't see enough voltage on the battery. Check the plug sometimes I have to give it a twist to make good contact. I know there is some kind of canbus trick the've mentioned it other threads.
; RED LIGHT FLASHING The red light flashing indicates that the battery
charger has AC power available and that the microprocessor is functioning
properly. If the red light continues to flash, then either the battery voltage
is too low (less than 3 volts) or the output alligator clips or accessory ring
terminals are not connected correctly.
; RED LIGHT ON STEADY Whenever the red light is on steady, a battery
is connected properly and the charger is charging the battery. The red
light will remain on until the charger completes the charging stage.
; GREEN LIGHT FLASHING When the green light is flashing, the battery
is greater than 80% charged. For BT Plus models the red light will also be
on steady. (Note: Does not apply to the 8V Plus or the 6V Junior).
; GREEN LIGHT ON STEADY When the green light stops flashing and
burns steady, the charge is complete and the battery can be returned to
service if necessary.
; ALTERNATING RED & GREEN LIGHTS FLASHING (PLUS) or SINGLE
LIGHT ORANGE (JUNIOR) This is abnormal and most likely indicates
either that the battery is sulfated or that there is a poor electrical
connection between the charger DC output and the battery posts. For the
BT Plus models it may indicate a reverse polarity connection on the DC
output cables (the battery is hooked up backwards).
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2019 K1600b Grand America, Blue Max.
Last edited by mwnahas; Oct 4th, 2010 at 9:46 pm.