CHMSL LED mod

[GOLDCYLON]

Originally Posted by spork2367

Have you done the calculations for any of this? Lets say every auxiliary light on the car (minus headlights and fog lights) draws 200 watts (my ballpark for our cars with brakes being applied probably accurate +/- 20 watts). That's about 17 amps. If you replaced them all with LED's, you could expect to cut that down to 6-10%, so you'd have 1.7 amps. So for approximation sake, best case, you save 15 amps. The 16 inch spal fans are 26 amps. I can't believe the alternator is so undersized that it can't accommodate the fan as is, but if that is the case, saving 15 amps isn't exactly a huge safety margin as you're still asking 8-10% more of the alternators max output.

If you're just talking about the CHMSL, it uses four #891 bulbs at 8 watts a piece for total of 2.6 amps.

If you swapped every exterior light on the car to an LED (including fog lights and headlights), you still wouldn't save the 26 amps a 16" spal uses. Total exterior light usage is 27 amps. Keep in mind, the power supplies used for LED fog lights and head lights are not as efficient as those used in small bulbs and they require significantly more power. So while a tail light LED may use 6-10% of the power of a standard incandescent, an LED headlight will be closer to 30-50%. Especially considering the original headlights were low wattage even by todays standards.

Other solution is...not using your brakes will save you 11 amps!...

Just some food for thought.

Lol that’s a lot of food there... and Math arrrrgggghhh. I have the interior kit, the headlights, the tail lights, side markers, backup lights, reverse lights, license plates lights and the spare tire light. All LEDs. I did not do the math (thank god for ken in Apollo 13 who just kept working the LEM startup sequence while the engineer ran the ammeter and the coffee pot) and I am running dual Dewitt spal fans with a standard alt with zero issues. Pretty much everything with the exception of the headlights and tail lights was bought online at super bright LEDs.