You will need a jack, jackstand, 10mm socket, 13mm socket, 3 or 6 inch extension, and an 8mm crescent, or box end wrench.
1) Use the 8mm wrench to disconnect the battery.
2) Set the parking brake, then jack the car up using the jackstand to support it when in place.
3) Test for stability by clearing everything fragile from under the car, then pushing on the car door firmly several times to make sure it is stable.
The starter will be behind the engine attached to the transmission (side).
4) There will be two nuts holding the positive and negative terminals, remove these with the 10 and 13mm sockets respectively.
The negative should the be the 10mm, and will be on top, the center will be the positive with two leads (13mm). There will also be a third nut, but the wire is attached to the starter, so save yourself the time and do not remove it.
5) Using the 13mm, and the extension, reach behind the starter to find the bolt and remove it. Do the same for the front bolt.
This may be a slow process depending on several factors I do not feel like expounding on right now. Reaching the one in the back may prove difficult, while the front one should come off pretty easily. I suggest doing them back to front to avoid a starter-to-the-face result.
Reverse this list for installation, except for the car shaking part.
The starter relay is attached to and an integral part of the starter.
check link below: http://www.youtube.com/watch?v=U6awyslXkeI
The starter on a 2000 Saturn SL is located on the bottom, left side of the engine. It is powered directly by the vehicle's battery.
Saturn L-Series was created in 2000.
Remove the positive battery cable from your 2000 Saturn battery. Remove the cables from the front of the starter. Remove the three starter retaining bolts. Reverse the process to install the new starter.
As with almost ALL modern vehicles, the starter relay is attached to and an integral part of the starter.
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The Saturn L series transaxle is in front of the driver, connected to the engine.
Check the wiring on the starter. Also check all grounds
Here is a how-to for a 2000 S-series. All s-series struts are the same http://www.saturnfans.com/forums/showthread.php?t=67077
Please visit my BIO page for a link to my Saturn help site. under the link at the bottom that says "Starter" you will find a visual reference to the location of the starter and as to what it looks like.
Saturn made more than one car in 2000 so you will need to be more specific! The s-series motor will not fit in an l series car though if that is what you are asking.