Notice that when I touch the black and white wire , marked + and - ,heater goes out, what's up? Oh yea, it's a gas heater 40 gal. & it has a little green light blinks

notice that when I touch the black and white wire , marked + and - ,heater goes out, Are you saying that when you tug on the wires the heater turns off? Is it a loose connection? Back to you, Tom

I'll try replacing connections to see if it works or see if I got a break in wire

Please let me know what you find. Good luck, Tom