Reconnecting battery while cables under hood disconnected?

[PostChris909]

Could this problem actually cause a short? My buddy reconnected my battery while intake sensors were still unplugged while not knowing smh. I disconnected it as soon as i found out (7 minutes later). Could this cause any damage even though the key wasn't in ignition?

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[jclausen]

No, but have your buddy stay away from the battery

[edjack]

Don't understand your post, OP.

[schatzy62]

Don't understand your post, OP.

He is asking if sensors are unpluged and reconneting the battery will caise things to short out or cause other damage.

The answer is generally no but as with any electronics it is possible, but highly unlikely in his case as many people disconnect the intake sensors with out disconneting the battery.

[edjack]

What are "intake sensors" and "smh?"

[RuskiE39]

No it will not.

[djb2]

I'm sure there are at least a handful of people here that have had the battery connected with the entire engine harness disconnected.

No designer would intentionally design a circuit that would fail with an intermittent or open connection, unless the was something difficult about driving the load (high current or high voltage).

[BimmrMeUpSnotty]

Why would you have all kinds of stuff disconnected, and then hook the battery back up? Stupid move, you will throw all kinds of codes because of that, will it cause a short, no, unless you have wires all boogerd up, laying around willynilly. It would be an issue if you had the fuse panel that resides underneath the carpet, bellow the glove box all disconnected from their terminals and your retarded friend came over and decided that he needed to hook up the battery because he needed to charge his stupid cell phone with the cigarette lighter, Fck yeah, that wouldn't be good.... COMMON SENSE

[djb2]

Note above that the key wasn't in the ignition. You won't set codes if you don't turn on the car.

[BimmrMeUpSnotty]

Note above that the key wasn't in the ignition. You won't set codes if you don't turn on the car.

Note to djb2, We don't know how stupid his friend is, now do we?

[PostChris909]

What are "intake sensors" and "smh?"

MAF sensor, manifold sensor, also alternator sensor. And smh means *shaking my head* lol

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[PostChris909]

Why would you have all kinds of stuff disconnected, and then hook the battery back up? Stupid move, you will throw all kinds of codes because of that, will it cause a short, no, unless you have wires all boogerd up, laying around willynilly. It would be an issue if you had the fuse panel that resides underneath the carpet, bellow the glove box all disconnected from their terminals and your retarded friend came over and decided that he needed to hook up the battery because he needed to charge his stupid cell phone with the cigarette lighter, Fck yeah, that wouldn't be good.... COMMON SENSE

Lmao you wildin

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[BimmrMeUpSnotty]

Lmao you wildin

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I wildin? WTF does is that? Ebonics or something??? Speak proper ENGLISH please, us old farts can't help you if you don't speak our lingo....

[Rlequerica]

I wonder what are the consequences of making a short circuit from positive terminal under hood and ground with a tool?

[edjack]

Enough energy to weld, or start a fire! Remember, that terminal is not fused; it comes directly from the battery.

[Rlequerica]

Thank you for answering.

The "positive jump stud" is connected to a hub with 3 connected wires on the engine compartment are they interconnected directly or having fuses among them?
What name shall I call that Hub?

Several times I accidentally touched with a wrench the +Jump Stud and valvetronic external case, spark plug bottom (not the tip), the camshaft case ( the valve cover is plastic).

What are the consequences on the car electronics? Computer, valvetronic, and oters?.

I understand that the only "damage from electric current" will be done to fuses, and conductors, or the battery or the wrench itself if it were more than one second.
But there are other damages from "electric voltage transient / peaks"...those I don't have experience.

Now assembling, the car is cranking but not starting, and a dozen of codes appeared.
I didn't find a "Negative Battery Cable with IBS", probably never replaced by former owner; see attached picture.....or may it be down the circuit going under the trunk...the picture shos a BMW original label attached....

And I frankly don't understand the operation of the panel on the battery with 3 positive bolts and some other for electronics; attached a picture so you please could help me.


Please shed some light for me.
Thank you


Battery Panel.jpg 669F759E-DFFA-45DA-81E3-CC7B7144BF20.jpg