1980 750H bare bones for mattylight

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27 Jan 2014 17:55 - 27 Jan 2014 19:04 #620286 by loudhvx
Replied by loudhvx on topic 1980 750H bare bones for mattylight
Do you have a schematic for that panel?

We've lost our filebase for schematics, do you have a wiring diagram for a 1979 MKII ?
Also, what is the letter designation for an 79 MKII? KZ1000??
Without the filebase it's very difficult for me to get details on the wiring since I don't have them all memorized.
Last edit: 27 Jan 2014 19:04 by loudhvx.

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27 Jan 2014 19:17 #620301 by Lazyman06
Replied by Lazyman06 on topic 1980 750H bare bones for mattylight
Unfortunately I don't on either :( in terms of what color wires I'm considering making my own harness so that won't matter to much and most of the wires for the MKII are the same for a LTD if I'm not mistaken

1979 KZ1000 MK II frame
1980 KZ1000 C3 police engine

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29 Jan 2014 12:54 #620492 by Schmeck
Replied by Schmeck on topic 1980 750H bare bones for mattylight
Hey Loudhvx you wouldn't happen to have a simple wiring diagram for a 79 kz750 twin would ya? Been reading your topic and your definently the guy to ask. Im running kick start only, headlight, taillight, two gauges on my handlebars with the backlights, horn, and toggle switches. Debating on a key switch from the auto store or not. I would really appreciate your help man.

1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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29 Jan 2014 12:55 #620494 by Schmeck
Replied by Schmeck on topic 1980 750H bare bones for mattylight
If there is a way You can incorporate an 8 pin Terminal block instead of the oem fuse box that would be awesome!

1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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03 Feb 2014 02:59 #620961 by Calebjkd
Replied by Calebjkd on topic 1980 750H bare bones for mattylight

loudhvx wrote: 1981 Kawasaki KZ550C2 Ltd. for Calebjkd


If I wanted to add the horn I would just branch off the "hot" wire to the horn button, to the horn itself, then to ground, right?

'81 Kawasaki kz550 ltd
'71 Yamaha xs650

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03 Feb 2014 04:56 - 03 Feb 2014 04:56 #620962 by 650ed
Replied by 650ed on topic 1980 750H bare bones for mattylight
Take a look at the 1980 KZ750-H1 wiring diagram in the link below. I believe when the horn button is pressed it connects to ground on the handlebars. So in the stock wiring a hot wire goes directly to one terminal on the horn, and a wire runs from the other terminal on the horn to the horn button. Then when the horn button is pressed it completes the circuit to ground and the horn is activated. Ed

mbsween.bike-night.com/kz750l3/media/KZ750-H1-US.jpg

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 03 Feb 2014 04:56 by 650ed.
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03 Feb 2014 11:30 #620985 by loudhvx
Replied by loudhvx on topic 1980 750H bare bones for mattylight
Like Ed said, the horn button connects to ground via the handlebars.

Run a wire from the top wire (which is switched hot), to the horn, then another wire from the horn to the horn button, which will connect to ground when pressed.
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03 Feb 2014 12:05 #620991 by Calebjkd
Replied by Calebjkd on topic 1980 750H bare bones for mattylight
Thanks guys!!

'81 Kawasaki kz550 ltd
'71 Yamaha xs650

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03 Feb 2014 13:12 #621001 by Gabe42
Replied by Gabe42 on topic 1980 750H bare bones for mattylight
Hey Loudhvx I have a pretty good understanding of all your diagrams, and they have helped me a lot, so thank you so much. But I have two quick questions, where should I start when following any of these wiring diagrams, and what gauge wire should I use? I think Im gonna use the very first one on the first page. I have a 1981 KZ750!

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03 Feb 2014 14:07 #621010 by Gabe42
Replied by Gabe42 on topic 1980 750H bare bones for mattylight
Nevermind, i read through the full forum and have my questions answered, but what if I wanted to keep my turn signals, could I just wire them into the starter/killswitch?

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03 Feb 2014 17:57 #621022 by loudhvx
Replied by loudhvx on topic 1980 750H bare bones for mattylight
If you check the diagrams, most of them, especially the later ones, follow a similar format. These are more or less schematics to show electrical function, but do not really show physical location of wires and components. Wiring diagrams show the physical layout along with more details on connectors etc.

My schematics generally (but not always) follow this architecture:

The power generation and regulation starts at the left side, battery and starter are usually just to the right of that, then ignition, then all of the lights and accessories are to the far right.

Current in the power generation, fuses, and main on/off switch flows from bottom to top. Then current for everything else flows top to bottom. (One exception is if the regulator has a dedicated detection wire, or if the alternator uses a field coil. That wiring will be to the far left, and current (if any) will flow top to bottom.)

The top horizontal line is switch 12v power, and the bottom horizontal line is ground.

Some of the earlier schematics may not follow this system, and may have things in different places, and power flow direction reversed (right to left, instead of left to right).

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03 Feb 2014 18:04 - 03 Feb 2014 18:07 #621023 by loudhvx
Replied by loudhvx on topic 1980 750H bare bones for mattylight

Gabe42 wrote: Nevermind, i read through the full forum and have my questions answered, but what if I wanted to keep my turn signals, could I just wire them into the starter/killswitch?


Keeping the above post in mind, you would tap into the top line for 12v power. So yes, you could tap from the top side of the kill switch, but anywhere on the top line will work as well.

Incidently, on the original Mattylight schematic, it would be better to leave out the optional fuse. Some Kawasaki's came with the fuse in that location, but it would actually be better to put it in the line coming out of the rectifier. I think Kawasaki eventually changed that fuse location back to the way it was in earlier KZ's because they realized it has the potential to do damage if the fuse blows, butthe bike keeps running.
Last edit: 03 Feb 2014 18:07 by loudhvx.
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