Pacific power batteries .com wrote on Friday, June 11, 2010 - 10:43 pm:
14.6. Test the alternator by disconnecting the battery with the engine running.
A battery as like a voltage stabilizer or filter to the pulsating DC produced by the alternator. Disconnecting a battery while the engine is running can destroy the sensitive electronic components connected to the entire electrical system such as the emission computer, audio system, cell phone, alarm system, etc., or the charging system itself because the peak voltage can rise to 40 volts or more. In the 1970s, removing a battery terminal was an accepted practice to test charging systems of that era. That is not the case today. Just say NO if anyone suggests this.
aa1car.com wrote on Friday, June 11, 2010 - 10:43 pm:WARNING: NEVER disconnect a battery when the ignition is ON, or while the engine is idling or running.
Doing so can damage electrical and electronic components.
www.automotiveforums.com wrote on Friday, June 11, 2010 - 10:43 pm:Yes, with the ignition on and high idle you can blow relays, radio and other electrical equipment. You need the battery to absorb amperage and voltage spikes. Some say this is a test to see if the alternator is charging. Instead, measure voltage at the battery while the engine is running. Should be about 13.8 volts. Don't test your alternator by disconnecting the battery.
http://wiki.answers.com wrote on Friday, June 11, 2010 - 10:43 pm:The battery provides voltage regulation. Without it, the bus voltage in your vehicle may exceed the working voltage of many electronics in your vehicle. Cars today have many digital electronics that are susceptible to voltage spikes and are often not well equipped to handle them. You could easily destroy the engine computer or your expensive music system for example.
Is this just a myth that's popular on the internet or do all these people/businesses have a point they're trying to convey?
answers.yahoo.com wrote on , , Despite what someone else has said: disconnecting the battery does not cause the mean voltage in the system to increase and you are not in any way "sending 14 volts through electronics designed for 12". Sensitive electronics are all protected by voltage regulators that will maintain proper voltage levels (interesting fact: many parts of a car's electrical system run at less than 12 volts, relying upon voltage regulators to drop the voltage).
The first one to say otherwise! Good to see.
www.ehow.com wrote on , , It may not be a good idea to disconnect the battery while the engine is running: especially with a newer model. This can make the voltage rise sharply, damage the engine control module and cause the car to stall.
I dunno I've done enough research. One person says it'll be fine because EVERY electrical component has modulators. But i think that's a lie. We pulled out the entire wiring harness inside the chaser to install into the zed, so unless those components are inside the actual case of the ecu's then i haven't seen ANY. I've seen lots of fuses though.
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