05-09-2017, 07:01 PM
(05-09-2017, 05:14 PM)Roger J Wrote: Some time ago I fitted LED bulbs to the stop/tail and front sidelights on my 12v Ruby. Recently, as I drove into the darkened garage, I noticed that the front side lights were coming on as I braked. Eventually found that the corncob type LED tail/stop bulbs were responsible.
On investigating I found that all of the individual |LEDs in the bulbs come on for both tail and stop function - but in tail lamp mode they are all dimmer.
There seems to be some kind of internal connection between the tail and stop pips which is allowing brake lamp voltage back out onto the side lamp circuits.
I cannot detect a resistance but suspect maybe a zener diode with poor reverse resistance..I put back the the old incandescent bulbs and all's well again.
I wondered if anyone else has come across this - or has any other theories.
Roger,
The problem you have with the LED lamps could be down to poor earths.
Run separate earths from the lamp unit bodies to a good chassis connection, you are dealing with semiconductors they have different characteristics
to filament lamps.Hope this solves the problem.
