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They (2) should be up by the firewall on the passenger side
under drivers side dash
The starter solenoid is on the left side fenderwell next to the battery.
Mine's located on the passinger side at the firewall.
Its located on the low side (suction hose) side, follow the hose from the accumulator to the a/c compressor.......
Inside the engine compartment on the passenger side wheel well.
the drain nipple is on the bottom of the radiator on battery`s side.
On your 1989 MERCURY TOPAZ, the BACK-UP LIGHT SWITCH is: UNDER HOOD, DRIVER SIDE, LOWER ENGINE AREA, MOUNTED ON TOP OF TRANSMISSION
Scrap yard, plenty there.
Way the heck up there on the driver's side. Its kinda hidden, because it is closer to the door on the left side.
ITS UNDER THE DASHBOARD ON THE DRIVERS SIDE. YES YOU HAVE TO STAND ON YOUR HEAD TO SEE IT.
Open the hood, look in the middle space between the firewall and motor. You will see the sensor comming out, IT LOOKS LIKE A SPARK PLUG. YOU WILL ALSO SEE THE CONNECTOR COMMING UP TOWARD YOU. MAKE SURE MOTER IS COOL BEFORE LOOKING.