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[martin341]

So have it sat in garage nearly 5 months for some maintanance and got it reassembled yesterday. Didn't fire up. Main suspect is startermotor, silent as a dead sparrow, and i had some problems with it in the winter as it froze up a few times. Where's the relay/fuse for startermotor?

But i also have a weird buzzing noise from abs ecu for a few sec as i turn ignition on. Haven't heard this before...

It's not battery fault as battery is good and i also tested directly from a booster.

All comments and ideas are welcome, especially about the buzzing abs ecu.

Oh, and battery was disconnected when i put her in garage.

[Bigron]

I hope you have a multimeter (or at least a 12 volt test lamp on leads) becuse you will need to test for 12V at the alternator (the big fat cable goes there first) and then at the starter connection. There are no fuses.
You are alnost certain to find all is well there, but worth checking to avoid looking foolish later!
Power gets to the starter itself via the solenoid that is piggy-backed onto the motor itself, so check for 12volts on the thin cable when the ignition is switched to "Start" position.
If nothing, then you need to trace back to the ignition switch.
If 12v present, suspect the solenoid. Two chief posibilities; if you are lucky, it could be jammed and some TLC might clear it. If unlucky, the solenoid wiring could have burned out.
There may be others come along with further suggestions, but you have to start somewhere - no pun intended!   

Ron.

[mandula]

Fast way to check without multimeter:

Put something metallic, like screw driver, between solenoid + and starter main + cable to jump start it.
This way you can check the starter motor, if it cranks it is OK.

At least this is how I've checked mine from older cars, usually fault has been on the start relay.

[martin341]

Thanks for replys!

I do now all the tricks of testing engine and components, as a startermotor, i repair light and heavy machinery for work

But as it's an Omega in question i thought maybe there's something i've missed on assembling...

And the thing bugging me is the buzzing noise from abs ecu because i haven't heard this before.

And how about immobilizer? Will it still crank the starter even if immo has died for some reason?