Why you should remove the negative battery terminal before doing ANYTHING!!!!

way, way, way too much.

As he always does, apparently. Gary L. Burnore doesn't know how to trim
posts.

 

Hi,
Probably you don't even know basic Ohm's law or Kirchoff's or
Tevnin Norton's theorem, etc. If you want to debate, email me directly.
Let's compare our CV first.

 

tony, this is usenet - "credentials" don't mean shit. just stick to the
facts.

fact 1 - batteries don't "surge". period. some [reactive] peripherals
can do it, unless protected. in cars, they all are. dome lights are
not reactive.

fact 2 - ohmic behavior dictates that battery voltage drops as current
increases, not the other way around.

fact 3 - ecu's are "idiot proofed". per #1, a dome light has no
reaction that could possibly cause a problem, even if the ecu was
unprotected.

conclusion: either address reality or move on.

 

No but a direct short could cause a problem in the item shorted. In the
case of some vehicles that could be the BCM if they use it for things
like an interior light timer/dimmer (close door and dome light stays on
for a bit) Shorting that circuit cause problems.

Yes BUT take a chunk of wire and toss it across the battery. Measure the
battery voltage. It likely won't cause a voltage drop as it heats up and
melts.

VERY WRONG. ECUs are easy to kill if you are not paying attention. My
SOP in the body shop is to pull the ECU on anything that rolls in for
panel work. One good zap from a welder can kill the ECU without being
near it.

--
Steve W.
Near Cooperstown, New York
NRA Member
Pacifism - The theory that if they'd fed
Jeffrey Dahmer enough human flesh,
he'd have become a vegan.

 

Yes,it will.That battery has internal resistance,and a short will draw a
lot of current and make for a heavy V drop.(the same happens every time you
start your car;there are specs for battery Vdrop while cranking.)

 

You are utterly without a clue. Best keep quiet.

 

On about 92 and up:

The dome light is connected to the Body Control Module.

RK

 

Hey, RK, how ya doin'?

I wanted to ask you something a while ago, but I forget.

At any rate, right. The DL is connected to the BCM, which MAY have a
connection to the ECM.

 

Hi,
Internal resistance is very small value. Against dead short it's not a
big factor. Cranking is not a dead short situation. Once I dropped a
pair of plier across heavy industrial battery terminals. The plier
litterally evaporated.

 

Boy, am I glad that my newest vehicle is an '83...

JT

 

"likely"??? dude, it /definitely/ does! grade school science class.

eh? welding is a whole different ball game to shorting a fuse protected
light circuit. welding is done at voltages and currents in excess of
those seen in vehicle operation, and is accompanies by all kinds of
radio frequency noise, both from the spark and the welder, depending on
welder type! yes, it's good to disconnect the ecu while welding. no,
shorting a light circuit doesn't replicate those conditions.

 

what is it then? state the number of ohms. typical honda civic battery.

it is when it's the largest resistance in the circuit!

sure. and how much did the voltage drop?

 

yes, which is not the ecu!

 

Maybe he reversed the polarity of the Bogon Flux ?

 

Hey, I can even _spell_ Thevenin

 

I talked to him last night. He says he wants you to come out and tell him
why his Pathfinder won't start after changing the dome light...

 

Anybody that says a short on a voltage line can't hurt an ECU has
never worked on computers.....

 

I'm doing great!

Thank you.

If anything is connected to the BCM, it will be in someway connected to the
ECM. Through a Bus or a connector.

RK

 

The BCM is always communicating with the ECU!

RK

 

It could be a coincidence?

Maybe there is another problem.

RK