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Aha ..... you found the gotcha as well


It is not the way you think ......... ignore the legs - look at the LED and the biggest part goes to +ve and the smallest part to the -ve
 

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Hi .... back from wet and windy Weymouth!

The red wire goes to the -ve terminal and the black wire goes to the +ve one; which not the way you would expect. Fit the LED and leave the body off. Sit the car on a powered up PB and the LED should glow a very deep and dim red but only if you are in a darkened room. It doesn't hurt to wire the wrong way round , but too much heat will destroy it.

Top tip ...... when siting an IR LED use a 2.8mm drill not the 3mm recommended by Scalex ........ you will get a good interference fit and the bulb will protrude by just the right amount.
 
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