How to test a Kawasaki junction fuse box relays and some of the diodes that are used to trip them with a 9 volt battery, without having to open it up.
A New 9 volt battery
is required so it has enough power to trip the relays and bias the diodes, but not enough power to blow anything.
Possible Relay Replacement seems ok but still needs more testing, as I want to see what voltage it will trip down to, I know a little 9volt battery will trip it so thats a good start. Search google or ebay for "HY3FF-DC12V"
Some of the junction boxes have 2 relays and we can check they both work.
You will need the diagram to show you the location of the numbered pins, and you will also be able to see what bits its checking.
You need to be in a fairly quite area so you can hear the relays tripping.
First thing to check is the starter interlock relay
and diode by going between pins 11 positive (Red) and 12 negative (Black) You should hear the relay clicking over, Now reverse the wires and the relay should not be heard tripping, if you can then the diode is shorted and needs replacing, if you hear nothing reverse the wires back over again to make sure it still works.
If during the checks nothing can be heard the diode is either blown open circuit or the relay is blown or your battery is not new enough.
Second thing to check is the headlight relay
if it has one and its 2 diodes, one diode is the trip diode and the other is the relay hold on diode. To start with go between pin 9 Positive (Red) and 13 negative (Black) you should hear the rally tripping, now reverse the wire and try again, if the relay still trips the diode is shorted and needs replacing, now switch back the wire and make sure the relay still works.
Now go between 8 positive (Red) and 13 negative (Black) and you should hear the relay tripping again, reverse the wires again and if the relay trips again the diode is shorted and needs replacing, switch back the wires and check the relay still works.
If during the headlight relay check the relay cannot be heard tripping at any time either both diodes are blown or the relay is blown or your battery is not new enough.
If you wanted to check the other inter lock diodes then you need to use a multimeter on the 2k Ohms range with the positive (Red) lead on pin 14 and the Negative (Black) lead on pins 12, 15 and 16 in turn. You should get a reading of about 750 Ohms, now reverse the leads and you should read open circuit on each pin. if you get open or short circuit on any test the diode needs replacing.
yorkie service manual information, but the overall diagram is all you need starter interlock relay headlight relay relay only testing with the battery, you need a meter for the diodes or have the LED like I have in the pictures above