Harry,On the track mate relay,there is an extra spade terminal that will become hot when the caution or track call is made.
This terminal needs to connect to another normally open 12v automotive type relay.
The extra relay will need to be powered up and grounded on its own separate terminals.I used the same power source and ground coming out of my pro.motors power pac.
Basically you want the yellow lights wired through your second relay,and the trackmate relay wire tells it to turn on when the track call is made.
very easy,and im probably making it sound harder than it really is!
This the relay I used,but they are available thru any parts store.
http://www.ebay.com/itm/191235529767?_t ... EBIDX%3AITThis one comes with a pre wired harness that makes the basic hookup a breeze,you don't have to figure out what terminals to use.