I recently picked up a used ecu as a spare to carry. While in camp last
night, I swapped the ecus out and was surprised to see heat damage to a few
components on the old ecu. I disconnect the battery before welding on my
bus but a couple of shops did exhaust repair on it without disconnecting
the battery. That said, the ecu parts could've been burned by a PO or
caused by my then newb engine swap electrical work.

On Tuesday, September 2, 2014, Miguel Pacheco <mundopacheco@gmail.com>
wrote:

I've always removed the starting battery ground before welding, thinking I
> was protecting the ECU. Maybe it's time to re-visit that issue.
>

--
Neil n

Blog: tubaneil.blogspot.ca

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http://tinyurl.com/d7gd5ej