Is the High Temp T-stat tripped?
Push To Reset Cover above Gas Valve
Left Side is for the 120VAC Circuit---electric
Right Side is for the 12VDC Circuit---gas
120VAC from CB to AC Junction Box (right side of WH Tank looking from the back)
Junction Box to On/Off Switch in outside compartment then to the Set of T-stats then to Element
*Black Wires---120VAC Hot
*White Wire----120VAC Neutral
***UNLESS your Model is a 'DEL'
That model uses 12VDC Relay to trigger the 120VAC to element
Uses a 12VDC Interior ON/OFF switch to energize the DC Relay (DC Junction Box Left Side of WH Tank looking from the back)
Rest of 120VAC Circuit same as above
Voltmeter......cheaper then throwing parts at it