Does anyone know where I can get elec. schematics for a '90 Stratos 285 PRO? Bought used and several elec. components aren't working. Schematics would help me troubleshoot the problems.

Unless someone has hacked it up, all the wires should have wire marker lables on the ends in the tank/battery area identifying what they are suppose to be connected to.  

Well, seems most of the wires have been hacked up. Right now, the trim gauge, tach and switches for the live wells aren't working.

I have found that on a boat that age it is best to completely remove all of the wires and run new wires one by ine to each accessory, maybe even consider buying a new fuse block. I ran into a similar problem once before, I had a boat that apparantly mice had gotten in the hull and just done a number on the wires. If this is the case on you boat dont bother just fixing the bad spots because they will just keep appearing in other place. On mine the mice had eaten the cover off the wires and I just kept having problems until I replaced it all new. Its not that hard or expensive and in the end you will waste more time searching down bad wires trying to fix them. I couldnt believe the damage these little critters could do to a wire!

gamblerOH, you hit the nail on the head. That's exactly what's happened. Thank for the input and I believe that's exactly what I'm going to wind up having to do. Thanks again!

I have a 89 285 Pro and I hope you know what you're getting into when you start ripping out all the existing wiring. The wiring/cables run through loops glassed into the cap to hold the wiring up where it runs down the gunwall. It's most likely tie wrapped to these loops also. If you start tugging on them, the loops rip off and everything is laying in a pile down the side. If you pull everthing out, it a good chance you will never get it suspended back up there in a neat manner. There is also no way you're going to come up with cable that has the connectors you have on the factory cable to make a clean, neat installation. The age of the circuit breaker panel is probably going to create problems trying to get all the nuts off them to disconnect the wires.

The trim guage works off the motor wiring harness, it's not uncommon for the sending unit on the motor go bad but check it first, they are fairly expensive.

Tach also works of the engine harness until it gets to the console.  You need to make sure you have the proper signal voltage to the tach.  Mine had a bad tach in it when I bought it, so they do go bad also.   Might want to check ground wires, they share multiple connections on the back of some of the guages.

Using a VOM it's fairly easy to trouble shoot. Check your voltages from the Power switch to the pump switchs. Turn them on and make sure the switch is good, then find the wire the switch is controlling in the back. More than likely, you will find the pumps to be bad if they are still connected. Look for a little white band near the end of the factory wiring, it has typed on it what pump it controls.