DIYbanter - View Single Post - Keeping car electronics alive while changing battery

Bud--

wrote:
On Thu, 25 Mar 2010 19:07:37 -0400, blueman wrote:

I need to clean the terminals and change out my car battery.
I would rather not lose the setttings on my radio.
But I also would rather not invest in a charger just for this
application.

I have several variable voltage DC power supplies (supplying about 1A).
Could I use such a supply set at say about 13-14V to supply temporary
power while the battery is removed?

Other than getting the voltage and polarity right, anything to be
worried about here or any chance of causing damage (to either car
electonics or to my power supply)?

Thanks

I had to do this on my father in law's cadillac where the whole car
gets a brain transplant when you disconnect the battery. I just
connected it up to my car with jumper cables, swapped the battery and
hooked it back up. Just be careful not to let anything short out.
This caddy has a "jumper" terminal away from the battery so the hookup
was easy. I just put the terminals in heavy leather work gloves
because I had that handy.

This sounded a little like overkill, but is sounding better all the time.

No worry about cig lighter is on, or door is open for lights. And (not
mentioned except by you) disconnected hot battery terminal can't be
grounded.

Temporarily connecting a 9V battery to 12V doesn't do anything?

--
bud--