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Discussion and questions related to the course Motorsport Wiring Fundamentals
I'v found over the internet some info about it but I think that should be ok to bring this subject over here.
In this post (http://www.shoptalkforums.com/viewtopic.php?f=54&t=138711) they say the following values:
Headlights ---- 14 gauge
Taillights ---- 16 gauge
Brake lights ---- 16 gauge
Horn ---- 14 gauge
Fuel pump ---- 14 gauge
Oil temp sender ---- 16 gauge
oil cooler fan ---- 14 gauge
Starter to Alternator ---- 10 gauge
Starter to Switch ---- 10 gauge
Ign switch to coil ---- 14 gauge
Alternator charge light ---- 16 gauge
Starter switch (B+)to solenoid for 12v power ------ 10 gauge
Starter switch (ST) to solenoid spade bit ---------- 14 gauge
I think that some of these gauges its a little bit oversized, eg. Alternator charge light 16 gauge (a little led on the dashboard would need a big wire like this?).
If I decide to use turn signal, tail light, parking light LED bulbs, I can use a smaller wire (20 awg I was thinking).
There is a good info about it here also:
Yea those are way too big, but will work if you think about it lol People are just scared of burning up wire so the double up on sizes
The fuel pump is kinda small, but I'm used to wiring aftermarket pumps that need 12awg+
Oil temp sender is 16awg? I've been using 24awg lol
on your question just do this, figure out how many watts the light bulb is, then divide by 14.4v. Typically tail light bulbs are less than 1 amp. You can also get a gauge to amp chart and it will tell you the appropriate awg wire to use.
I've checked some specs on theses led bulbs:
They have pretty much the same power consumption and amperage draw no matter if it is 35 SMD or 65 SMD...
2W / 14.4v = 0.13A
3W / 14.4v = 0.20A
According to this website (http://www.powerstream.com/Wire_Size.htm), I should be fine with 24AWG, i think that I will go with 22AWG because in brazil its almost impossible to find the correct terminals to crimp smaller wires.