Yours being a 1997 model the electric side and the gas side are completely separate systems (Atwood combined their operation/controls in 2004).
The electric side is feed directly from 120V AC circuit breaker to/thru ON/OFF switch (on backside on water heater) to/thru the set of t-stats (high/normal---on backside of water heater) to electric heating element (yours is a screw in type element)
The propane side is feed from 12V DC dist panel (fuse) to/thru ON/OFF switch to/thru normal t-stat (in outside compartment---may have thermal cut out fuse) to/thru control module to/thru high temp t-stat ECO---outside compartment) to gas valve (and spark electrode at same time).
Do you even get any sparking at electrode?