Yamaha YZF R125 How to test motorcycle relays

Yamaha YZF R125 Blog Index - Contents

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Testing a starter relay is quite easy.

basic equipment needed is 12v battery with 2 x wire i use crocodile clips .

you can also use a small test bulb as well .


if you need to buy a new relay then try here New and Used 

or you can invest in good and safer tool like the 12v powerprobe and 

snap of test light probe i bought and are excellent .

i always have a fully charged 12cv battery with crocodiles knocking about it saves loads of hassle 

The relay , the small terminals are what connect to your starter button and 

carry a lot less current .

the larger terminals are connected direct from battery to the starter motor so 

need larger wires to carry the massive starting currents .

I am using the power probe here as its safer but you can just as easily 

connect the 12v negative to one side and tap the positive on the other side 

you should hear a click as you touch the positive and remove it .

You can go a step further and add a test light to it and confirm current it 

going through the secondary circuit .

to test with a lamp you need to connect one end on test light circuit to 

battery positive and the to one of the relays larger terminals 

and then use another cable from second larger terminal to negative of battery 

ill do basic circuit diagrams at bottom of page .

Now when you put power to the smaller terminals it should click but also 

the light should flash on and off as you tap power .

OK not the best , never have been very good with Windows Paint 

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