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Author Topic: Tail light problems  (Read 905 times)

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Offline GregCarv

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Tail light problems
« on: March 16, 2014, 04:21:18 AM »
Hi All,

I recently bought a cb750 k6 and switched out the old wiring harness for a new one, and upgraded the fuses to flat ones
(lots of melted wires and connectors). The ignition switch wires were completely fused together so I had to cut off the old plug, and attach a new plug.

I also replaced the tail/brake light for a new one with 3 wires. I wired everything according to the manual (I think). The problem is as follows:

- Brake lights work when brakes are active
- Tail light only works in park
- Tail light doesn't work otherwise

note: this was already working as stated above before I replaced the plug on the ignition switch.

Any thoughts on this? Wondering if my ignition plug wires or the new harness wires may be flipped , or if the bike is supposed to run without a tail light.
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CB750 k6 (currently being rebuilt)

Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.

Offline MoMo

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Re: Tail light problems
« Reply #1 on: March 16, 2014, 04:54:07 AM »
check and see if you have 12v at the brown wire under the seat...Larry
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Offline GregCarv

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Re: Tail light problems
« Reply #2 on: March 16, 2014, 04:59:24 AM »
I get a 0.20 v reading when switched on. Gonna check for continuity on the fuses again to see if that's working ok.
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CB750 k6 (currently being rebuilt)

Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.

Offline GregCarv

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Re: Tail light problems
« Reply #3 on: March 16, 2014, 05:54:09 AM »
found the problem.... looks like the switch has gone bad. Tested continuity on the switch points at the different positions. Looks like the tail light has no connection.

Hmm... has anyone ever disassembled one of these switches?
Ordering one at the moment is not really an option. (I live on a small island in the middle of nowhere)
An order for an 12 dollar switch would cost over 100 to get it here.
« Last Edit: March 16, 2014, 06:07:03 AM by GregCarv »
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CB750 k6 (currently being rebuilt)

Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.

Offline MoMo

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Re: Tail light problems
« Reply #4 on: March 16, 2014, 06:11:39 AM »
I have fixed them, found dirty contacts inside.  Be very slow when disassembling and note where all the parts are placed...Larry  TwoTired has a post somewhere on the forum(at least I think it related to switch repair)...Larry
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Offline GregCarv

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Re: Tail light problems
« Reply #5 on: March 16, 2014, 07:19:34 AM »
Thanks!! will give it a shot. At least the ignition and brakes work. I will have to avoid riding at night, and wait until I have to order a bunch more parts to get a new switch (which won't be far off).


 
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CB750 k6 (currently being rebuilt)

Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.

Offline GregCarv

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Re: Tail light problems
« Reply #6 on: December 07, 2014, 11:43:39 AM »
It turned out the problem wasn't the switch. I needed to bridge a couple of wires. That got it working.
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CB750 k6 (currently being rebuilt)

Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.

Offline Don R

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Re: Tail light problems
« Reply #7 on: December 07, 2014, 09:48:05 PM »
 The replacement harnesses sometimes need a jumper in the headlight bucket to get the taillight on. I forget which colors, mine connected two female ends. I think it has something to do with US and Euro bikes being different. The harness are all the same.
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Offline GregCarv

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Re: Tail light problems
« Reply #8 on: December 08, 2014, 09:21:16 AM »
Yep, that's what did the trick. It was a new harness, the old one was partially melted. Pretty much replaced all the electrical bits on the bike. Fuse holders were half melted. Quite a few wires melted together. Had to do a lot of soldering the first month I had the bike. 
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CB750 k6 (currently being rebuilt)

Imagine a puddle waking up one morning and thinking, "This is an interesting world I find myself in — an interesting hole I find myself in — fits me rather neatly, doesn't it? In fact it fits me staggeringly well, must have been made to have me in it!" This is such a powerful idea that as the sun rises in the sky and the air heats up and as, gradually, the puddle gets smaller and smaller, it's still frantically hanging on to the notion that everything's going to be alright, because this world was meant to have him in it, was built to have him in it; so the moment he disappears catches him rather by surprise. I think this may be something we need to be on the watch out for.
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