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2022 Outback Wagon 2.5
99 Posts
The dimming effect you have observed is ordinary and common to quite a few Subarus...

If it bothers you to the point where you want to do something about it, I might suggest converting to LED brake lights- the reduced current draw will make for less of a voltage drop.

I haven't seen an aftermarket voltage regulator.

For later models, you could consider using freeSSM to artificially raise the idle.
Are LED brake lights just a bulb replacement solution? Has anybody on this board actually done this with a result that solves the problem?

Is the dimming also related to the ABS, Battery dash lights coming on intermittently?
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