Spark Plug Replacement?

[lindajane]

Hello,

My clock stopped working on my 83 Mercedes Diesel.
I removed the corresponding spark plug. It was White.
I had Red, Blue and a yellow fuse. No white.
I put in the Yellow fuse. And it works.
I can't seem to find the wattage of a yellow spark plug.
I believe the white spark plugs are 8 amp.
Can I just leave the yellow one in there?...Can it
hurt anything if technically it's the wrong wattage?
It works.
Thanks much
LindaJ