Hotwire help please - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

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post #1 of 21 (permalink) Old 06-21-2019, 11:30 PM Thread Starter
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Hotwire help please

Hello all,

Recently bought a '89 'm 750 which was in parts including the wiring harness removed. I was told she was running prior to being stripped down.

My question is; what is required to run this bike electrical/wiring wise and what do i need to get there?.

I've bench tested the starter which is good, but I surmise I need to at least bypass the ignition and bypass to get spark to the spark plugs?.

What would be the simplest way of accomplishing this?. Id be okay running my own wire from the positive terminal to whatever is needed just to temporarily get the engine running.
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post #2 of 21 (permalink) Old 06-22-2019, 08:30 AM
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Does the bike still have the electrical accessories mounted? Junction Box, Ignition system etc etc?

If so power the ignition system directly and crank away. There are wiring diagrams published on here showing the connections

'99 Vulcan "Victoria"
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post #3 of 21 (permalink) Old 06-22-2019, 12:54 PM Thread Starter
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Hey thanks for getting back to me. There are no accessories. No gauges, ignition switch, shut off switch, lights, ECT.

I have looked over a few wiring diagrams. Maybe you can confirm if my initial plan is on the right track:

1). Wire new switch controlling the starter.

2). Wire a switch from the battery which sends power to the ignition coils.

^ if I did both of these would the engine be sufficiently wired to, in theory, run?.

Thanks again!
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post #4 of 21 (permalink) Old 06-22-2019, 03:37 PM
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Quote:
Originally Posted by Joed500 View Post
Hey thanks for getting back to me. There are no accessories. No gauges, ignition switch, shut off switch, lights, ECT.

I have looked over a few wiring diagrams. Maybe you can confirm if my initial plan is on the right track:

1). Wire new switch controlling the starter.

2). Wire a switch from the battery which sends power to the ignition coils.

^ if I did both of these would the engine be sufficiently wired to, in theory, run?.

Thanks again!
CDI has to get power and needs wired to the rest of the ignition components.

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post #5 of 21 (permalink) Old 06-22-2019, 07:41 PM
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Ditto on what Spockster said. Pretty much every wire on the CDI needs to be properly connected (or for pin 5, be connected to ground instead of the JB if the JB is MIA to think it's connected properly)

If the wiring (CDI/JB) is in-tact except for the stuff on the handlebars, then you can just put constant voltage on the red wire (ignition) and wire a button for the starter wire (black).

If your R/R is still connected to the stator, make sure the monitor wire is connected to v+. Probably better to leave it completely disconnected in the initial phase if wiring has been messed with around the junction box.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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post #6 of 21 (permalink) Old 06-22-2019, 10:41 PM Thread Starter
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THANK YOU GENTS! I feel like I am very close to understanding this now. Just a few more questions (promise)

I've taken a few pictures of the harness. The part in confused about / want to clarify before frying the junction box is: how do i run constant power to it as you guys directed?
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post #7 of 21 (permalink) Old 06-22-2019, 10:43 PM Thread Starter
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I guess I am just failing to see where i need to run the wire from the battery to power the JB and then, from which JB wire to hook up to the coils. (I realize I'm showcasing my ignorance, but really want to make this project work). Thanks again
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post #8 of 21 (permalink) Old 06-22-2019, 11:51 PM
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for the coils I did this

https://www.vn750.com/forum/19-elect...relay-mod.html

Seems to give a hotter spark and bypasses the JB

Here's a wiring diagram
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2003 VN750
Velorex 562 sidecar w/trunk
2-wire mod
Headlight power switch
Manual fan switch
Shingigen SH775
Blue wire mod
Yellow wire mod
RLU removed
RR moved
Voltmeter relay wired
Coils direct wired w/relay
TOC MCCTs
handicap mods:
extended foot shift
heel shifter
extended brake pedal
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post #9 of 21 (permalink) Old 06-23-2019, 01:59 AM
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Uh, maybe someone else can bullseye which wires are the right ones, but there's supposed to be a short but beefy length of wire with an eye that bolts onto the positive battery terminal, and that wire runs to one of the big terminals of the starter solenoid (which you currently have plugged on to the molex connector for the R/R) and attaches via a spark-plug boot looking thing. That boot should have a second, much smaller wire (white/red) running out of it, through a bullet connector, and then into the wiring harness which eventually connects in to the junction box as a white/red wire on pin 1.

I'm squinting really hard, but I don't see either of the wires that should hook on to the starter solenoid. It's possible those are still attached to the battery/frame? disconnected from the harness at the bullet connector?

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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post #10 of 21 (permalink) Old 06-23-2019, 07:45 AM
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I will add the connector with 3 yellow wires in a row (total of 6 wires in connector) is the connector for the R/R. its dont hook to the starter solenoid (it looks like its connected in the last pic, but may just be placement of the items)

also, I see 1 coil, there are 2 coils. each coil with 2 spark plug wires (2 plugs per cylinder, 2 cylinders, 4 plug wires total)

also, do you have the CDI box? it has electronic ignition, and that box is required.

2005 VN750

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