I can't find the main fuse that the owner's manual says is under the seat. I can't seem to understand the diagram that show it in the owner's manual.

I you search on google with year, make and model also say fuse box or fuse box diagram it will give you some links to chose from. You can also say year, make and model and manual or owners manual and if it provides you vehicle you can look in the manual for fuse box diagram and location. Most of the time you have fuse box under hood, in front seat area, back seat area and trunk it just depends on year make and model.

I don't know model year? So I can't post a diagram. Hopefully your owners manual will show you location of applicable fuses and relay where applicable. Your fuse box cover may have this info. www.fleet.ford.com may have your owners manual Then you check applicable fuse and voltage on fuse circuit. As far as applicable relay, the control side of relay needs voltage and ground, the load side of relay needs voltage.

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It Is under the hood in the fuse and relay center. Consult the owner's manual or use the bottom of the lid for ID of fuses.

Your owners manual should have a diagram in it.

The fuse box should be located under the hood, probably on the driver side

Check fuse --if blown -replace. Posibly wiring connector under seat unplugged.

It is under the back seat on drivers side. The owners manual has diagrams showing fuses for each circuit.

One in engine compartment drivers side over wheel... another under the back seat on drivers side. Owners manual (page 362 and next) has diagrams showing fuses for each circuit: 2003 Chevrolet Trailblazer - Owners Manual.

Hope help with this (remember rated this help).

the fuse diagrams are usually located under the lid to the fuse box and check out www.edmonds.com for an owners manual online.

Do you an Owner's Manual to look at. There are two fuse boxes on the 2000 Buick LeSabre. One is under the hood an the passenger-side at the front and the other is under the back seat. The Owners manual has fuse diagrams on pages 6-62 and 6-63 for the engine compartment box and pages 6-66 and 6-67 for the under seat box. Pictures and instructions are also included starting page 6-61.