It is the rear driver side.
The 1991 Dodge diesel truck glow plug relay is located in the fuse box. The fuse box is located behind the battery box. The glow plug relay will be in the right upper corner of the box.
Number three is the rear passenger side.
We're do I find glow plug relay
where is the glow plug relay on a vw sharan 97
the glow plug relay can be found in the super rapist tard section of your beetle
how locate glow plug relay on 2008 Volvo diesel 2.0D
air charge resistor relay
wire diagram for 1999 Ford F250 diesel glow plug relay
On the bottom of the engine.
Inside cab, to the left of the steering column under the dash is the relay / fuse panel. On that panel is the glow plug relay.
It is important to have a diagram for a glow plug relay. The diagram can be found in book for the specific car, or online in car forums.