Join Date: Jan 2008
Location: Boston, Lincs
Seems to me that you are getting the full 12 volts on to the LED itself, instant destruction.
LEDs work on about 1.5 Volts so they have a " dropper " resistor in circuit to reduce the 12 volts. Some Automotive LED's have this built into the LED itself, others use an external one. Sounds to me that its possible in this case that an external one is used and has gone short circuit/low resistance, quite unusual. Here's the hazy bit. The snag is going to be in locating this, somewhere in the Dash PCB ? Or maybe the resistor is built into the switch ? Or near the LED itself ? Sorry, no help on this bit.
There is a possible bodge to this. Assuming that my initial theory is correct you could put a resistor in series with the feed to the LED, about 1.5K Ohm springs to mind but you would have to confirm this, all should work then.
All a bit theoretical I'm afraid but may give you, the mechanic or an Auto Leccy some pointers.
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Last edited by Nige005; 03-10-09 at 10:13.