Drove through a puddle,power steering out and temp gauge on high, battery light on

SOURCE: I have a 2003 Dodge

Thanks for choosing FixYa and welcome to the site. A flashing check engine light can mean internal engine/transmission damage. It may be something else. Since it is on I presume, you need to have it scanned. You may already know this but it has come on because your computer has detected a problem with your vehicle. Take it to Autozone or Advanced to have it scanned. They do this for free. It should show what is wrong. To be honest, this is your best bet. You will know what it is instead of guessing. Since all your lights are acting like this, you may have an electrical issue. The alternator may be going bad or it may be a bad wire to the alternator. Your losing power from somewhere and possibly getting a power surge also. It really needs put on a machine to find it. Electrical issues can be difficult to find. You can start the truck and unplug the hotside battery. If it instantly dies, the alternator is bad. You may just have a bad connection. You might want to change the terminals and possibly the wires. Inspect the hot side wires to your alternator. Test them with a voltage meter to see if there are any differences in current. You really need the computer scan first though. The staff at the auto part store can explain the stored codes for you and tell you what you need for free. Usually a flashing check engine light means engine/tranny problems. This may not be the case though. I believe it may be something electrical.

SOURCE: truck was running fine, just

Hi, my name is John I will do my best to assist you.

I suggest that you test the ECU Electronic Control Unit using the following procedure.

WARNING
When removing or installing the wiring harness connector to the control unit, the ignition switch must be in the OFF position.

1. Using a voltmeter, measure the voltage at the battery, in order to assure that enough current is available to operate the starting and ignition systems.
2. Remove the coil secondary wire from the distributor cap.
3. With the key in the ON position, use a jumper wire to momentarily touch the negative terminal of the coil to ground while holding the coil secondary wire approximately 1?4 (6mm) from a good engine ground. A spark should be observed.
4. If no spark is observed, turn the ignition key to the OFF position, then disconnect the four-wire harness going to the Electronic Control Unit (ECU).
5. With the ignition key in the ON position, again use the jumper wire and ground the negative terminal of the coil while holding the coil secondary wire approximately 1?4 in. (6mm) from a good engine ground. If a spark is observed, replace the ECU.
6. Check pin No. 5 of the ECU for ground. If no ground is obtained, check the ECU for poor or dirty connections and tight mounting screws.
7. Reinstall all connections and check for spark. If no spark occurs, replace the ECU.