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940 computer 900

posted by  Amarin on  Sun Aug 24 09:29 CST 2014
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

Hello,

If I may answer this one Spook..

This is to prevent spark at the disconnected terminal going to the ECU. If you took out the positive terminal spark may occur and this surge travels down to the delicate ECU, damaging it. If you took out the negative usually there's no spark but if there is its already past the ECU so no damage done. When connecting back just connect the negative terminal again. I usually took more precaution by turning on the parking lights before connecting back the negative so that any current surge is absorbed by those lights.

If you're changing the battery (not at this time but in the future), disconnect the negative first then positive next. When connecting back, connect the positive first and negative last.

I learned this during owning an Alfa Romeo last time with much more delicate electronics. Our Volvo is much more hardy but no harm taking these precautions.

Regards,
Amarin.






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