I have a new bike(to me). My temp gauge is non operational. Any ideas?
Download the Kaw vn750 service manual in Kanuck69`s first post here:
Many of us like the Clymer service manual as well.
Temp gauge test
on page 336 of the Clymer manual.
1 -remove fuel tank. (Not sure, but you might not HAVE to remove the tank, but it will make seeing what you are doing easier.)
2- Remove right side steering neck cover.
3-Disconnect yellow electrical connector from thermostat housing.
4-Turn ignition switch to ON position.
5- Temperature gauge should read "C".
6- Attach a short jumper wire to the yellow wire electrical connector.
7- Touch, then release
, the jumper wire from a good ground like the thermostat housing.
With the jumper connected the gauge should read "H".
Disconnect the jumper wire immediately or it can damage a good gauge.
8- With the jumper wire disconnected the gauge should drop back to "C".
9- If the gauge readings are correct it is ok, but the sensor may be faulty and needs to be tested.
10- If the gauge readings are incorrect
, either the gauge is faulty or the wiring between the gauge and the yellow electrical connector is faulty. Inspect wiring and/or sensor.
There is a test for the sensor
that involves suspending the sensor in a container of coolant, while it has ammeter probes attached to the electrical connector and grounded to the base, and heating the coolant slowly while watching a shop or candy making thermometer.
Simplified, what it says is that at room temp there should be NO continuity (infinite resistance)
At 80*C (176*F) there should be 42-62 ohms resistance.
At 100*C (212*F) the resistance should drop to 22-33 ohms.
If it fails any of these tests it must be replaced.
When you reinstall the (new or old) sensor, apply a light coat of silicone based sealant to the threads.
Put everything back on, refill with coolant and plug any wiring back together.
(Now is a good time to start using dielectric grease to protect all connections from moisture and corrosion.)
Hope this helps. Let us know what you find.