Which relay is the power control relay for a 1989 grand marquis 5.o v8

Hi...here you go! Please rate my answer...thanks!

Firing order 1-5-4-2-6-3-7-8

Yes they both use the same basic 4.6 Liter V8 engine, the difference is the Marauder engine is a higher powered and uses Dual Overhead Camshafts and 4 valves per cylinder (DOHC) the Grand Marquis is Single Overhead Camshaft (SOHC), it will bolt in but you will need the all the electronics and the wiring harness including the Powertrain Control Module/computer (PCM) to make it work. You will greatly increase the Horse power of the Grand Marquis.

fuel pump is protected by a relay. see owner manual for location.

PCM power relay powers up PCM. PCM then powers up fuel pump through fuel pump relay.

Also, check to be sure inertia switch is not tripped. In trunk. look for label or look in owner manual for info.

from autozone.com

For the 1996 Mercury Grand Marquis 4.6L V8:

Firing Order:
1-3-7-2-6-5-4-8

Cylinders:
.........(back).......
..|..4..|........|..8..|
..|..3..|........|..7..|
..|..2..|........|..6..|
..|..1..|........|..5..|
O<--Coil packs-->O
.........(front)

Coil:........................Coil:
.(back)....................(back)
(1)...(3)..................(7)...(8)
(6)...(5)..................(4)...(2)
(front).....................(front)

Let me know if this helped or if you have additional information or questions. Feel Free to contact me FixYa.com!

For the 1992 Mercury Grand Marquis 4.6L SOHC V8:

Firing Order:
1-3-7-2-6-5-4-8

Cylinders:
.........(back).......
..|..4..|........|..8..|
..|..3..|........|..7..|
..|..2..|........|..6..|
..|..1..|........|..5..|
O<--Coil packs-->O
.........(front)

Coil:........................Coil:
.(back)....................(back)
(1)...(3)..................(7)...(8)
(6)...(5)..................(4)...(2)
(front).....................(front)

Let me know if this helped or if you have additional information or questions. Feel Free to contact me FixYa.com!

For the 1998 Mercury Grand Marquis 4.6L V8

Firing Order:
1-3-7-2-6-5-4-8

Cylinders:
........(back).........
|...4...|.......|...8...|
|...3...|.......|...7...|
|...2...|.......|...6...|
|...1...|.......|...5...|
.........(front)

Let me know if this helped, or if you have additional information questions. Feel Free to contact me at FixYa.com!

For the 4.6L V8:
Firing Order:
1-3-7-2-6-5-4-8
Cylinders:
(back of engine)
4-----------8
3-----------7
2-----------6
1-----------5
(front of engine)

Let me know if this helped...

1-5-4-2-6-3-7-8 Looking from the radiator Passenger side front to rear, 1-2-3-4 Drivers side front to rear 5-6-7-8 Number one on the cap should be at the 11 o'clock position. Do you know how to spark time an engine?

pull each fuse one at a time and check them , or use a multi tester to check them to find the bad one. if you are going to pull and visually inspect each one individually be sure to put them back in the same hole they came out of.