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Amp draw before and after LED.
1978 to 1991 9th gen chevy/GMC suburban and pickups with the same lighting scheme.
OE running lights draw 3.75 amps.
OE brake lights draw an additional 3.5 amps.
OE halogen low beams soak up 10 amps.
At a stop light after dark sitting there with the brakes pressed the electrical system demands 17 amps.
That's a lot if you are trying to be out driving around with no alternator.
With a mix of mostly LEDs and some incandescent instrumentation and running lights it uses 2 amps (mostly due to OE dash lights I never changed over to LED and the front blinker/running light that I can not switch to LED or my blinkers wont blink)
LED brake lights added an additional 0.5 amps
LED head lights use 2.5 amps.
At a stop light after dark sitting there with brakes pressed the electrical system now demands only 5 amps.
12 amps makes a big difference.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
Last edited by oil pan 4; 09-25-2015 at 04:47 PM..
Reason: After testing I found one 194 running light burned out, they draw 250ma
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