Problem with Windstar 2000

I have a windstar 2000 engine 3.8 and lately when starting battle a little or the needles go crazy or the interior lights are turned on or the range of the CA is turned on or the overdrive is turned off and blink the indicator on the board or flash the Theft indicator on the board among other strange things that he does, my question is will be the computer.
I already check the battery, change the terminals and have looked for some short but nothing, they tell me that it is the computer, I hope you can help me.

It can be a problem of mass offenses or false contacts. Try to check the vehicle's masses oppose a clip or cable of the Negative Motorcycle support and connect and test

Let's do the test and warn you what happens.
grax.
I already check but the failure continues.

Czech the terminals where the solenoid go and squeeze them, I had a problem with a lobo lomismo like it and so solve it

I'm going to check that has seen what happens thanks.