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Bleah, not enough amps
Submitted by reikiman on Sat, 10/13/2007 - 15:14
Dang. The Lectra is still so close I can taste it.. but... The two major pieces left before it could be taken on the street is a) wiring the manual on-off switch I mentioned before, and b) getting the lights to work. I got the switch and am pondering choices on mounting it on the bike. But today I wanted to get into the lighting system.
The lighting system is a mess of wires in a wiring harness, and include in-line fuses and turn signal relays etc. Probably the existing wiring harness works but it looks like a mess and I keep thinking I want to cut it all out and start over. In any case I need to work out which parts of the harness go where etc.. at the end it might be a simple enough matter to find two wires for a 12v connection and the whole thing lights up. But so far it hasn't been that simple.
Anyway I tried connecting the lights directly to the DC-DC converter just now to make sure they're all working... and it gave me a chance to measure the amp load.
Wiring the lights directly was successful and the lights do indeed light. However....
The headlamp (a normal incandescent headlight) draws 4.6A @ 12v (or about 45 watts). The turn signal I hooked up (an LED unit) draws 0.6A in normal mode, and 1.5A in turn signal mode.
The DC-DC I have is home built from two individual DC-DC units. Each are 2.5A so the total capacity of the DC-DC is 5A. If you add up the amperages above it's well above 5A, powering the headlight and running lights will draw over 8A and close to 10A if a turn signal is on. Doesn't sound like I'll be able to put a stereo system on this bike... }:)
Bleah.. my DC-DC doesn't have enough amps.
The options I can think of are:
- Find an LED headlight that requires fewer A's and is still DOT approved
- I have two more of the DC-DC units, so I could wire them in and make the total be 10A
- Find a bigger capacity DC-DC unit.. EVPARTS has some which might work