Thanks,Check the simple things first
Most likely the computer is OK but the fusible links immediately connected off the battery may have failed. They supply power to most of the electrical components. Check all the fuses in both fuse boxes, under the hood and to the left of the steering column in the cab. Identify what things work. Like lights, radio, fan etc. And no, automotive computers don't need to be reprogrammed.
I checked the fusible links with an ohmmeter and they have continuity and battery voltage is measured on the downstream side, two links I believe. I checked the fuses and didn't see anything blown there. I haven't written down all the systems that work and don't. As I recall, the lights work. The ignition, the door locks, the power windows, don't work. I don't recall testing the power seats. I can't remember what worked or not on the instrument panel.
Here is a cursory check of all 3 fusible links in system.
This assumes an OEM configuration.
Dome lights working? (FL AM1)
When you turn the key to ON does the CHARGE LAMP light up? (FL AM2)
Brake lights working? (FL MAIN)
If yes to all 3, then all 3 fusible links are intact.
Oh that should save some time. Thanks again.
It is VERY unlikely that the ECU is damaged.Due to inattention I reversed polarityed the battery teminals and may have damaged my computer. If I replace it with a used one do I have to have it reprogrammed so everthing plays together properly?