I have 1992 lexus sc400 and thecar wont start. There is no power period. i;ve change the altenator and battery and still no power. No dash lights ...head lights...nothing. Battery and altenator checked out good. Where do i start? besides checking my terminal wires..yes they are tight.

Is the shifter stuck in park or it moves and nothing happens?

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The clicking noise from the fuse box is the starter relay, that's normal considering the rest of the symptoms as it will stop working under a certain voltage like the rest of the lights and whatnot, then the voltage will rise again since all the accessories and everything turned off and everything will try to power on again, making the voltage drops, and so forth. If the battery is good and the car does this, then you definetly have a grounding problem. Either the connector on the battery is loose, or you have a damaged/corroded grounding strap/wire. Start by checking the connections on the battery to see if they are loose or not, and if they are fine, check the wire from the connection for corrosion or damage, and do the same thing for any other ground wires or straps and you will be sure to find your problem and get it starting like it should. The only other possibility which is VERY VERY VERY rare to see is a broken leed on the battery posts, which will not be visible since it happens inside the battery, but if you changed the battery recently or have tested with another battery, you can rule that out from the start and i'm 100% sure you only have a grounding problem.

There should be defect with sensors. check with engine scanner

the computer is bad and also these cars are known for the insturment clusters to go bad along with the computer. get them both fixed and it will solve your problem.

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if you can charge the battery and drive it for a while then sounds like the altenator has failed and is not re-charging the battery, good way to test is to charge the battery, start the car and turn the light on, if everything is dimm or the motor dies there is little to no charge voltage, and will require altenator work

remove the 2 10mm bolts on top that you can see, then remove front part of inner fender liner you will find 2 10mm nuts. you will need a long extension. Recomend using duct tape around feneder area to avoid scratching.

Change the 15amp fuse in the kicker fuse panel labeled cig. My stopped working for the same reason.

I got this problem on my 1995 sc400, it does need some service.
spark plugs replacement, fuel injecters cleaning, replace fuel filter. thats all, and if you wont spend for that only remove the battery wait a couple of seconds and put it again. this thing will slove the problem for some days. but i recomend to do a full service.
KEEP IT COOL!

check ECM fuze , also look and make sure all plugs are pluged up reset EUC which fuse exactly( google it) alot of steps