Relay clicking question?

[rfischba1]

I have several cucv's and a few of them make the clicking noise when the igintion is turned on, this would be the relay switch engaging?

The other trucks do NOT make and clicking noise, but still start, does the clicking sound mean the relay is working?

Have not tried this in cold weather yet?

 

[mangus580]

Its possible that the ones you dont hear, have a different style relay.

If the trucks are starting, your glow plugs are working. Only on the hottest of summer days will they start without the glow plugs.