Randy Dawson hotmail.com> writes: >=20 > Here's the low-tech, non-electronic fix. The part you want is a "Negativ= e Temperature Coefficient > Resistor" a NTC. Put these in series with your lamps, they are availabl= e with a starting resistance of a few > ohms to hundreds of ohms - for a 12V system pick a range of 20 ohms or less (or they will never heat up) >=20 > When they do heat up, they go to almost zero. An added benefit, it will add life to your lamps. >=20 > Randy This may work for conventional filament lamps, but HID lamps use a high power inverter (a.k.a 'Ballast') to get sufficient voltage to both strike the lamp (~15000v) and keep it running after (80v at 1/2 amp or so). Any significant resistance in the supply path will prevent the lamps from starting, in fact the OP's symptoms (initial flash then a re-start) suggest a poor supply or ground, and if this is shared with the ECU then it's not surprising things are going pear shaped. Mike --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .