Remove the positive battery cable first. The starter is on the passenger side of the engine. Might be easier to get to from below. Remove the bolts holding the wiring to it than the bolts that mount the starter in place. Be careful if it has shims that you make sure you put them back in the same way. (These are little thin spacers that go between the mounting surface and the starter). Installation is reverse. Probably would take you no more than 30 minutes to do it all.
From what I understand, you have to diconnect the exhaust system on the side that the starter motor is located on. To reassemble you have to replace the exhaust gasket with a new one. If you are replacing the starter, there is a GM starter that is a direct replacement for the Isuzu starter and costs quite a bit less.
The starter on a 94 Isuzu Trooper is located on the bottom, passenger side of the vehicle. It is found at the rear of the engine, at the flywheel.
It is located on the flywheel.
bypass key on a trooper
The starter for the 1992 Isuzu Trooper was a little difficult to locate, honestly. One may find it on the driver's side of the motor, directly above the oil pan.
under the hood in the fuse box
Starter Relay Isuzu Trooper (Diesel Engine) located in fuse box (engine room), grey color. They have 4 relay (Power Windows-black, AC-black, Engine/Alternator-blue, and Starter-diesel engine-grey)
Isuzu Trooper was created in 1981.
1999 Isuzu trooper
I found that the easiest way to get to the starter of an 1987 Trooper II is to take the front right wheel off. You should see it right there, and with relatively easy access.
If it has shims now and you buy an OEM replacement starter, then use the shims. If it does not have shims then you will not need them. Replace the starter with an exactly duplicate, installed exactly as the original. If in doubt measure the distance from the mounting plate face to the end of the drive gear shaft and make sure that distance in the same on the replacement starter.
timing marks for 1996 Isuzu trooper