how come will kill OBC?

 

the stored charge in the capacitor maybe be higher than the obc voltage durig the discharge cycle. the chip can be sensitive to spikes.

 

deleted by lmk

 

I did that for my HID fog lamps. Working perfectly so far.

 

well, like i say, just becareful lor.
my OBC reads errors, seat belts, lights, DTC lights all blinking.... and when i remove the cap. everything's normal.

 

Maybe my OBC is already dead, that's why it didn't complain about my HID fogs.

 

How was your capacitor connected? What's its value? Which light output connector did you wire this capacitor?

 

on my red tail light.
100 microF. 15V
parallel with positive end to the positive wire.

one more thing, i used to connect my reverse sensor for my reverse cam using the reverse light. It caused some flickering on the screen. i put a capacitor across the bulb in parallel it cures the flickering problem but it blew the bulb after about 2 weeks. therefore i resort to using a relay instead.

 

Interesting. the discharging path of the caps should be back to the source through the +ve wire. Maybe a smaller cap is better?

Were you using a LED bulb? The cap should be wired parallel with the LED & its series resistor, not just the LED. Otherwise, it may blow it. If you are using a filament bulb, I cannot figure out how the small charge stored in a 100μF can blow a filament bulb.

 

that's what i thought....but....i was wrong.