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Author Topic: Just need a little direction,--fuse order--electrical problem 1975 cb550  (Read 2369 times)

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Offline L.A. Nomad........

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Just need a little direction,--fuse order--electrical problem 1975 cb550
« on: January 17, 2006, 11:03:14 AM »

1975 CB 550

When the key is turned on, with the headlight and tail light on. What kind of power should I be getting to the fuse box?

There are 3 fuses left to right 1,2,3. I'm only getting power to fuse #3. Fuses 1 and 2 have no power.
Everything works fine, head lights, tail light and starter motor. I'm just not getting power to the points and plugs. I've cleaned the points with a points file, but there's just no power. I think it might be the kill switch?

Am I suppose to be getting power to fuses 1 and 2 when the key is turned on?

Thanks, L.A. Nomad
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Offline TwoTired

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #1 on: January 17, 2006, 11:51:30 AM »
Quote from: L.A. Nomad........ on January 17, 2006, 11:03:14 AM
When the key is turned on, with the headlight and tail light on. What kind of power should I be getting to the fuse box?

Battery potential.

Quote from: L.A. Nomad........ on January 17, 2006, 11:03:14 AM
Am I suppose to be getting power to fuses 1 and 2 when the key is turned on?

Yes.  What terminals are you measuring accross?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline cadler

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #2 on: January 17, 2006, 11:56:40 AM »
Is it possible fuse 2 and 3 are spares? I have a cb750 and they have 2 spare fuses in case you need one in an emergency.

Power and voltage are 2 different things, Power = Volts X Amps

Just trying to help
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Offline bryanj

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #3 on: January 18, 2006, 12:14:46 AM »
1975 CB500? Where are you as that should only exist in UK and have one fuse in a white plastic holder
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline TwoTired

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #4 on: January 18, 2006, 12:23:35 AM »
I'm thinkin' Bryanj might need computer glasses.   8)

I do. ;D ;D ;D

Even so, sometimes we read what we are looking for.  I have.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline bryanj

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #5 on: January 19, 2006, 08:18:03 AM »
Damn! you is right! I must stop doing keyboard time after a long night at work. Yup the 550 has 3 fuses 1 for "main" 1 for sidelights and 1 for headlight it does make the loom more complicated with more connections to corrode though
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline L.A. Nomad........

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #6 on: January 19, 2006, 10:43:37 AM »
It's 550k and I figured it out. This model has a light switch, unlike my other 76 Cb550. When The light switch is on, all fuses get power. When the switch is off only the main fuse has power.

My points and coil were not getting any power, I figured out the kill switch had an exposed wire. So out comes the black electrical tape!

Thanx, Nomand


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I am a fuel-injected suicide machine! I am a rocker! I am a roller! [I’m an outta controller] I am the Chosen One! The Mighty and the Vengeance! Sent down  to strike the unroadworthy! I'm hotter  than a rolling dice!

Offline Jetsurly

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #7 on: August 17, 2018, 09:48:04 AM »
So my 75 CB550F has 5 fuse places... does anyone know Aif they take the same amp fuse for each spot? I’m totally new to this bike and unfortunelty not in town but headed home. I was going to stop and get new fuses on my way. Help please!!  :)
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Offline TwoTired

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #8 on: August 17, 2018, 10:00:51 AM »
The stock five position holders use the two outer position as spare fuse holders.
IIRC, the center position is the 15 A, the two adjascent are 7 A.

They are labeled on the fuse holder.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Jetsurly

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #9 on: August 17, 2018, 10:04:05 AM »
Thanks for the quick reply! The 15A fuse is missing and the one next to it (right side) is blown. That must be why my buddy couldn’t start it? And I just realized 15A means 15 Amps. (Face palm)
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Offline Jetsurly

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #10 on: August 17, 2018, 10:04:43 AM »
And SP mans spare. Oh man I need more sleep
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Offline calj737

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #11 on: August 17, 2018, 02:22:09 PM »
Quote from: Jetsurly on August 17, 2018, 10:04:43 AM
And SP mans spare. Oh man I need more sleep
Quote from: Jetsurly on August 17, 2018, 10:04:05 AM
Thanks for the quick reply! The 15A fuse is missing and the one next to it (right side) is blown. That must be why my buddy couldn’t start it? And I just realized 15A means 15 Amps. (Face palm)
Welcome to vintage Japanese motorcycle vocabulary  ;D
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline bryanj

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #12 on: August 20, 2018, 08:18:32 AM »
Correct, to see the screen I need glasses to see the keyboard I need to take them off!!
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline calj737

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Re: Just need a little direction,--fuse order--electrical problem 1975 cb550
« Reply #13 on: August 20, 2018, 08:23:02 AM »
Quote from: bryanj on August 20, 2018, 08:18:32 AM
Correct, to see the screen I need glasses to see the keyboard I need to take them off!!
Your arms are too short   ;D
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis
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