SOHC.co.uk Forums > CB500/550
H4 headlight
Lobo:
I don’t know the 500/550, but given both the ‘750 & 400 fours have 13A alternators I’ll assume the same for this bike. (quoted at 5000rpm for the 400F, and I guess similar for 550/750)
Ball park numbers...
Alt field coil... 2A
Ignition coil... 2A (assuming one at a time)
Tail lamp ....0.5A (5W)
Brake..... 2A (21W)
Indicators... 3A (@ 18W each)
Headlamp ... 5A (60W proposed)
.... totalling 14.5A + loom / bullet connector / corrosion losses if your bike a bit weary.
Of course it’s unlikely all will be on together, but simply riding with the headlamp on will be needing 9.5A - a tall ask of the alternator if not at high’ish rpm.
I had to get interested in this guff as one day drained the battery on a low speed day in town traffic - I now try to switch off the headlamp if <3000RPM.
Happy to stand corrected!
JezzaPeach:
G’day Lobo, many thanks for your time laying that out. As an electrical ignoramus that helps me understand a lot better. If I’m going down a long hill decelerating with full beam on, braking and indicating, I’d better not sound the horn!!!!😂😂😂
Sounds from other comments that non-USA bikes are better ‘covered’. Mine came from Italy so I may be fine but I’ll look at getting an led tail/brake light as an easy win.
Best wishes and thanks to all.
cliff7:
Don't forget the idiot bulbs and speedo and tacho illumination, maybe another amp.
deltarider:
--- Quote from: jeremypeachey on August 12, 2020, 03:32:25 PM ---... so I may be fine but I’ll look at getting an led tail/brake light as an easy win...
--- End quote ---
I don't quite understand. Is there a problem then?
JezzaPeach:
I started the thread after seeing a comment elsewhere that changing the headlight bulb to a ‘modern’ H4 might overload the 15A fuse if headlight + rear, indicator and brake were all applied together, although it’s possible the comment was a one off.
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