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Where does this wire go?
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post #1 of 6 (permalink) Old 09-01-2010, 08:11 PM Thread Starter
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help headlight problems

New to forum I have 04 vn750 the headlight fuse has 13.89 volt but at plugin for light it only has 11.00 at idle and when rev up volt go down to 1.0 or less. From reading there must be a relay some were can some body point me in right direction. Or is there something that some one knows of a problem that will cause this. And were can i find a wiring diagram.
thanks for any info.
dangler
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post #2 of 6 (permalink) Old 09-01-2010, 08:43 PM
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Welcome to the Vulcan madness dangler.

Electrical gremlims are not my strong suit, but I will tell you what I can.

Here is a link to a free service manual. It is big, so save it after the download.
http://www.tocmanufacturing.com/File...nd%20Parts.pdf

Link to wiring diagram for junction box (JB), which has a headlight relay.
http://www.scribd.com/doc/8941017/circuits

IIRC, in the 10 pin connector on the JB, there is a blue wire at pin #13 (in the diagram above) that connects to the headlight relay. To test the relay, or as a quick fix to get home in the dark, try this procedure. If you pull that blue wire and connector out of the plastic retainer, and put it into the empty space next to it marked by the "O", the headlight should have power. That pin has power as soon as the ignition switch is turned on. The headlight relay does not close, to light up, until the starter button has been pushed (and the alternator starts to charge too, I think).

The JB is not designed to be taken apart and repaired, just replaced if any components fail. slimvulcanrider has been working on a rebuildable JB, but has not posted much about any progress or sales lately. He moved this summer and is training for another deployment as well.

I think I read a few weeks ago where one member has rigged up a separate relay with a manual switch, to power his headlight.

When you get power to the headlight again, you might consider the HID conversion the lance328 recommends in post #8 here:
https://www.vn750.com/forum/showthrea...ght+conversion

Good luck.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 09-01-2010 at 09:03 PM.
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post #3 of 6 (permalink) Old 09-01-2010, 10:04 PM
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it is pin 8 on the 10 pin connector... move that wire to the middle un used pin
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post #4 of 6 (permalink) Old 09-01-2010, 10:24 PM
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Quote:
Originally Posted by slimvulcanrider View Post
it is pin 8 on the 10 pin connector... move that wire to the middle un used pin
There is a wire marked number 8, but no pin number 8 in the 10 pin connector in that wiring diagram slim.
http://www.scribd.com/doc/8941017/circuits

That is a blue wire in the harness though, isn`t it?

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127

Last edited by OlHossCanada; 09-01-2010 at 10:32 PM.
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post #5 of 6 (permalink) Old 09-02-2010, 06:34 PM Thread Starter
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Thanks for the info OLDHOSSCANDA & SLIMVULCANRIDER . This sound like a common prolbem . At least i can get the light to stay on that way.I can wire in a relay like i did for my radio on my other bike.
again thanks
dangler
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post #6 of 6 (permalink) Old 09-02-2010, 08:35 PM
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adding in a relay is what I would do personally Dangler..

OlHoss, you are right... i was cutting and pasting from another thread I read. the pin numbers are wrong, but the wire color is most defiantly blue.
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