Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
OKay sorted everything out today.
1 DRL uses low beam filament.
2 At reduced battery voltage. So 9-10Volts @7.56amps with engine off.
3 Closer to 10Volts @8.36 amps with engine running. If you do the math and it doesn't add up it is because filament resistance increases with heat so the more current flows through the hotter it gets and the more resistive the filament gets.
4 Well 8.36 amps running through a 10 amp fuse is cutting it close, engineering practice is to never exceed 80% of rated value (I'm at 83.6%).
5 Both low and high beams are fused at 10 amp for each filament. So I'm expecting to blow high beam fuses soon. Low beam are in specified ampereage limits.
6 Now I checked wiring size and this guage is good to 25 amps at +40°C or (104°F)
7 So if I blow these again I will up the fuse to 15 amps from 10.
8 Only piece of electronic that might not hold-up is the relays and I'll replace them when they go.
These bulbs don't draw too much they just draw more.
Last edited by Coby7; 07-24-2013 at 06:15 AM.