Auxiliary Battery

[WVC]

Does removing the F42 fuse and disconnecting the auxiliary negative battery cable still keep power to the N1 terminal?

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[chevymitchell]

Does removing the F42 fuse and disconnecting the auxiliary negative battery cable still keep power to the N1 terminal?

Yes. There will still be Main battery 12vdc at N1 by doing this.

 

[Fudster]

Does removing the F42 fuse and disconnecting the auxiliary negative battery cable still keep power to the N1 terminal?

Not only does it, as Shawn @chevymitchell illustrates, more to point, removing the F42 fuse causes a situation in which, provided your main battery has power, N1, will never not have power. To rephrase, with F42 disconnected, the only way for N1 to not have power is to disconnect your main battery or have a dead main battery.

With Fuse 42 connected, the electrical break between N1 and N2 occurs for an instant at cold crank when, as per factory spec, the ESS/Aux battery is isolated and tested for power, and during ESS events. These are the only times with factory wiring when N1 will solely be energized by the ESS/Aux battery if present.

But yank that Fuse 42 and the relay that separates N1 from N2 when energized can't get the power it needs to effect that separation, and N1 will always be alive in a JL with either or both of its dual AGM batteries, provided those batteries hold current.

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