Gas gage and speedometer doesn't work - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 06-25-2010, 12:48 PM Thread Starter
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Gas gage and speedometer doesn't work

I just bought my first bike ever--A 1992 750 vulcan. Got it real reasonable and now finding out why. The gas gage isn't regestering anything nor is the speedometer working. Could this be a fuse that controls both? Is there a fuse box on this bike. Is there somewhere I could get a owners manual or maintenance manual for this bike?

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post #2 of 5 (permalink) Old 06-25-2010, 01:04 PM
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Fuse box is behind the left cover (when sitting on bike, the side your left leg is on). Its a square plastic black box. Pop it open and you'll see the fuses.

VROC Number: 31246
2003 Kawasaki VN750 SOLD
2006 Honda VTX1800C
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post #3 of 5 (permalink) Old 06-25-2010, 01:59 PM
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Also... here is a link to the service/maintenance will take a bit to download but hey.. its free.
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post #4 of 5 (permalink) Old 06-25-2010, 02:20 PM
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The speedo works off of a cable from the front wheel.
The gas gauge has a connector under the seat, should check that first.
BTW welcome to the group.

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post #5 of 5 (permalink) Old 06-25-2010, 02:22 PM
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Welcome to the Vulcan madness steve. Congrats on getting a Vulcan.
Here is a link to a free downloadable manual.

Many like to have the Clymer manual too. Check the ebay link at the bottom of the forums list. You can often find a second hand manual for a reduced price there. Haynes prints one as well, but I have not seen theirs.

Speedometer runs off a cable coming from the front wheel. Disconnect cable from the drive gear and check for a broken end. If OK then spin the cable with your fingers and watch for speedo gauge needle to move. Try to reinsert cable into drive gear properly and test drive to see if it works now. If not, remove front wheel and check drive gear unit.

Junction box (JB)/fuse box is behind the left side cover. Pop black cover off from the bottom edge.

If fuses are all good and fuel gauge still doesn`t work, use this test
- Remove seat.
- Disconnect the fuel level 2 pin electrical connector (one white/yellow and 1 black/yellow wire) at the end of the fuel tank.
-Turn ignition switch to ON position.
- Fuel gauge should read "E".

- Use a jumper wire (an opened out paper clip will do) to BRIEFLY touch the 2 terminals in the connector attached to the harness on the bike (not going to tank). The gauge should read "F" now. IMMEDIATELY DISCONNECT JUMPER WIRE, or risk damaging gauge.
-the gauge should drop back to "E'.

- If these readings are correct the gauge is ok.- Either the sensor in the tank is faulty or the wiring between the sensor and connector is faulty. Inspect and/or replace sensor and wiring.

There are some soldered connections under the sensor cover on the bottom of the tank. You will have to remove and drain the tank to do this inspection and repair.

I hope this helps.


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

H-D windshield
Relocated R/R
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July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15

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