What could cause all these flashing lights?

[waymegelli]

A few days ago, I posted a question about the battery conditioner I incorrectly attached to my 996 TT for four months. I took it to the dealer and they replaced the ECU that was fried and I got the car back on Friday, June 19. It ran fine on the 20 mile drive home and again Sunday morning when I went out to do some P-Box 60-130 runs. I installed a new Europipe exhaust Sunday afternoon and went out for a drive. After about 10 miles, various warning lights came on - in fact, I think every possible warning light came on including brake failure, passenger airbag failure, check engine, etc, etc. I turned around to go home and the engine began missing once in a while. The it got worse. Then the A/C quit. Then the radio quit. Then more engine missing. Then the windows start going up and down. Finally it completely died about 2 miles from home. I got it towed home and sat down and cried. Not really, but almost. What could be causing this? Maybe I got one of the O2 wires too close to something and it melted? That wouldn't cause all these problems, would it? Did the dealer screw up the new ECU install? I'm having the dealer pick it up this morning, but would like Renntech input in the meantime. Thanks!

[Loren]

I would certainly take it back to them.

When replacing the DME (ECU) you need to make sure all the proper options are set - especially if they could not copy the old DME info.

It is also good practice to run a diagnostic on all the car control modules at that time. And, of course, they should have road tested the car.

[RFM]

Let check the battery and the electrical load circuit also.

[MY996TT]

I think it is the battery too. When my battery was dieing about two weeks ago, I had all sorts of lights coming on one after the other. Everything was back to normal so far, excepted for I needed to disconnect my battery (I did it over night, but some say 30 min. is good) to reset the ECU.

[waymegelli]

You've all been almost right - not only did I fry my ECU by connecting the battery conditioner incorrectly, I also fried something in the alternator, so as the battery was dying, I got all the flashing lights. The dealer replaced the alternator, recharged the battery and checked everything out. It runs like it's supposed to now and I'm going to do the Softronic chip from Vivid in the next couple of days.

Major lesson learned - don't hook up a battery conditioner backward or be prepared to pay about $3000 to fix things. OUCH!

[MY996TT]

You've all been almost right - not only did I fry my ECU by connecting the battery conditioner incorrectly, I also fried something in the alternator, so as the battery was dying, I got all the flashing lights. The dealer replaced the alternator, recharged the battery and checked everything out. It runs like it's supposed to now and I'm going to do the Softronic chip from Vivid in the next couple of days.

Major lesson learned - don't hook up a battery conditioner backward or be prepared to pay about $3000 to fix things. OUCH!

Or spend another $60 more to get the one plugs into your cig. lighter... then you won't connect it wrong.