I don't know whether its good practice or not, but the shop that
replaced my last battery did it without shutting the engine off. The
alternator kept voltage on the system and there was no problem.
EJ in NJ
Bill G. wrote:
You're a lucky guy. But you know Murphy'laws... And there's more than a
serious opportunity to fry up sigma converter in the alternator. So my
suggestion is to purchase a jump starter (a small battery, usually
packed up with lots of accessories, i.e. light, compressor and so on and
to plug it into the lighter plug. This will keep all electronics up to
12 V level, while you take away the old and plug in the new battery.
Just as an example of what I mean for jump starter:
I agree with you both (Cordy and Tiger) that it is not the best practice
to remove the battery with the engine running. What I objected to was
the absolute statement that it would "fry your alternator". I assure you
it did not. Its been two years since the battery was replaced. How long
does it take to fry an alternator :^))
EJ in NJ
You were indeed lucky.
Battery acts like a reservoir or buffer in the charging system. The
alternator also relies on the battery voltage to maintain the correct
output. Missing either in the system MAY (not always though) damage
anything that are still connected.
Ernie Willson wrote:
Good idea, that's what I use as a backup to open the trunk in case of a
dead battery. I would never worry about losing my radio's memory, you
can always enter the code. It's not so much info/setting like on a
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