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[Richo]

Anybody have any advice regarding welding on 1999 diesel xj cherokees, ive just had my mot done and been given an advisory for some welding that needs doing to the chassis rail just forward of the drivers side rear Spring mounting.
I know to disconnect both battery leads but have read some horror stories on US forums that you can fry the PCM unless thats disconnected as well, not sure how to disconnect them and dont really want to disturb them if i dont need to, anybody with any experiences or advice I would like to here your comments, i dont want to totally fry my Jeeps electronics.

[Jonny Jeep]

I've welded on my TJ without disconnecting the battery or PCM. Done the same on vehicles at work too. I'm not sure it matters much, if at all, as long as you have a good clean ground close to the place being welded.

[Richo]

Hi thanks for the info, i have always disconnected both battery leads but after reading on some of the American forums about frying electronic components i started to worry, I really don't fancy playing around with the pcm connections and possibly causing more problems, they have never been pulled apart since the day it was built.
Just had a bad day trying to fit a replacement transfer case linkage (from Amazon) but it will not fit i suspect because its a diesel and the gearboxes must sit further forward, so the adjustable linkage is far too long, more wasted money, so will have to reconditioned the original setup and live with it.
Thanks for the reply.
Cheers Ian