We have a NH TG245 that the top,front cab work lights won't come on when switched on with the light switch in the cab   They will come on  though when the tractor is running and and you shut it off.  They'll come on momentarily at shutdown, just like they always did but won't turn on otherwise.

    I've checked the fuse for the lights and it's ok. 

Anyone have any idea what might be wrong to cause this?   There are a couple of relays that say they are for "egress lighting"  which I assume is when they come on when the tractor is shut off. Could a bad relay there keep the switch from turning the lights on?

TIA

Steve