Please dont give out information that can lead to a seriously high repair bill.. doing this might destroy your cars entire wire harness and just about everything else that is electronic too, since the battery acts as a regulator for the alternator, keeping the voltage close to 12 volts. Without the battery this can surge to 40 volts or more, burning out your electronics... not a good idea

 

Agreed.

 

Never heard anyone disagree with this before. Been doing it for 14 years and have seen over 10 ase techs do it the same way. I guess I can see your point as well.

 

It is not recommended to do with any late model car with ECU's. Say about 1995 on up. You'll still see it done, sure. But you take your chances. Once in a while, the voltage or current surge will damage an ECU.

 

Makes sense definitely. I use my multimeter as well which is a nice help. Take the car to autozone if possible they usually test for free

 

Never heard anyone disagree with this before. Been doing it for 14 years and have seen over 10 ase techs do it the same way. I guess I can see your point as well.
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not to mention its the ground you want to disconnect not the power. this was the procedure back when cars had no ecu now its a different ball game. disconnecting the power can cause a short or a spark between the terminal and the cable, or even the chassis.

 

Disconnecting the battery while running on an S2000 will spike the rectifier inside the alternator and cause a flickering dash at idle.