The fuse for the mixture heater wires for a 1998 Nissan D21 for cylinder is an electrical device which interrupts the flow of current when there is overloading.
The dust particals sticks on the wires where from it sense the flow of air mixture.
The firing order for a four-cylinder Nissan 1400 truck is 1,3,4,2. The plug wires should be attached in a counter-clockwise manner.
It's on the side of the transmission, had 2 wires and looks like a little black cylinder.
heater resistor burnt out! Located under glovebox near heater motor.(held in with 2 screws) 4 to 6 wires coming from the resistor.
Bank 1 is located on the same side as cylinder #1. The spark plug wires are numbered.
Your wording is a little tough but what you are asking is what the two blue wires are under the passenger seat. If the seats are heated, they would be the wires for the heater in the seat.
2 wires
On a 19 year old vehicle I would suspect you have a vacuum hose that is leaking. Replace all under hood vacuum hoses.
check the compression
there are two wires
the water heater operates at high power compared to the lights and so the water heater requires a larger current. The wires supplying current to the water heater are thicker so that the wires have a low resistance. This reduces the risk of the wires overheating.
Tail of the transmission. Drivers side.2 wires One 10mm. Pull it straight out. There will be some resistance from the seal. I did it last night.