Maurice, For what its worth, here is what I did for the Great Lakes. Our 37+ has the light array too but like Ken says it must have been an option. I had a small holding tank and 3 water tanks. I converted our port side water tank to holding and put a tank monitor on both holding tanks that just tells me when it's almost full. I used a Dometic DTM01 sensor. I wired the LED bulb to the panel and it works great. I never run out of water and always refill when I pump out the holding tanks. Dometic can be purchased thru Defender and there is a 4 light sending unit too.
Len Mitchell Crazy Legs 1989 37+ Midland On. Sent from my mobile device. _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray