Being a 2008, you likely have two EIM's (one under the dash and one in the bilge) which use momentary switches. The fact that the lights flash on with the switch indicates that the switch is OK. The problem is in your EIM... that's where the latch is supposed to take place. There are no relays... it's all electronic.

 

What does EIM stand for & what does it look like? I don't see a # for it in the parts manual.

 

electronic interface module
square plastic box black with a clear plexi cover with thumb screws
but if you actually have a normal switch by itself ,its not controlled by the eim

 

Looking at your schematics, it does not appear to have EIM's (surprise to me for this year model). I also do not see any relays. Is it possible that someone (PO) changed the switch and inadvertently installed a momentary?

Are any of the other switches momentary?

 

The switch and wiring look original & used to work properly. Thanks for looking at the schematics they look like a foreign language to me.

 

I was just thinking, it's a momentary on switch but the cockpit lights are supposed to stay on; it seems like there must be something that keeps them on unless the switch is malfunctioning.

 

I have a problem with my cabin lights and fans on my 1987 250 Sundancer. They all went out at once but all other 12v functions in the cockpit are fine. I know of only one fuse box which is located in the head under the dashboard but all of those fuses are good. Does anyone know where the fuse or relay to cabin lights is located?
MS Mark