Electrical issue

Tiny
MT28DAVIDSON
  • MEMBER
  • 2002 TOYOTA SEQUOIA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Does it hurt a vehicle to have it "jumped" to roll up a window, when the alternator is left out of the vehicle? (What I mean is have a vehicle without the alternator in it, hooked up to a vehicle with full power, and then turn the vehicle without the alternator on to accessory and roll up the window?)
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Tuesday, January 19th, 2021 AT 9:29 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
There's nothing wrong with that. The computers and the window motor don't know or care if the current is coming from another vehicle through jumper cables, or from its own battery.
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Tuesday, January 19th, 2021 AT 9:51 PM
Tiny
MT28DAVIDSON
  • MEMBER
Thanks so much! I am asking as there has been a discovered wiring "issue" (i.E. There was a part of the wiring harness frame harness, that has corroded a bit, and apparently this allegedly caused another part of the wiring harness to be melted, and I am just trying to wrap my head around it and if jumping it without an alternator in it contributed to this damage) with a vehicle that this was done on and I was just making sure. Thanks!
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Tuesday, January 19th, 2021 AT 10:51 PM
Tiny
CARADIODOC
  • EXPERT
I understand. Almost all modern vehicles use a 12-volt electrical system. "Voltage" is electrical pressure, just as pounds per square inch, (psi) is water pressure in a pipe. With electrical systems, it doesn't matter what develops that voltage, the circuitry will operate normally. Think of the generator as an electrical pump, just like a water pump, and the battery is the storage tank, just like a municipal water tower stores water under pressure.

The battery supplies the current, or electrical flow, at first, then the generator takes over once the engine is running. All of the circuitry has no idea where the current is coming from. That can include connecting another vehicle with jumper cables. That would equate to someone opening a huge valve so a nearby town's water system could temporarily supply your town. When you turn on a faucet, you don't know if that water is coming from the pump or one of the storage towers.

Electrical theory can be very difficult to understand, especially for people who learn best by seeing things and manipulating things with their hands. This usually applies to people in trades like auto mechanics. Electrical theory has to visualized because we can't see, but I had real good luck teaching it by comparing everything to something similar that we can see, as with water.
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Wednesday, January 20th, 2021 AT 9:27 PM

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