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2001 L auto
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Discussion Starter · #1 ·
Recently got some of those ARB intensity knock off lights, measured @ 130w each. Them on the bumper plus 4 130w hella 500's on the roof basket makes 780w & 60a, which seems like too much for the 75a stock alternator. I know some other Subaru's have higher rated alternators, will any of them drop into a sf? The more expensive aftermarket offerings aren't an option due to $.
 

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2001 Forester S, 4EAT
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2,864 Posts
You're going to need an after market unit that puts out at least 120+ amps. Even the stock ones only go only up to 90amps. Good luck.

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2001 L auto
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Discussion Starter · #4 ·
Yah I found one on ebay from an '05 legacy for $60, I think that's what I'm going to do. I don't know how I could get something with more amperage without spending alot more money.
 

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2001 Forester S, 4EAT
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The car needs almost 90amps to function. Adding your lights puts you well into the 150amp range.

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2001 L auto
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Discussion Starter · #6 ·
There's no way it needs almost 90 to function. The stock alternator is only rated to 75, and once alternators heat up they lose 15%ish. I think with 110 rated from the 05 legacy I'll be alright, or I hope so at least, cause I can't afford anything more expensive.
 

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2015 Forester CVT
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687 Posts
Recently got some of those ARB intensity knock off lights, measured @ 130w each. Them on the bumper plus 4 130w hella 500's on the roof basket makes 780w & 60a, which seems like too much for the 75a stock alternator. I know some other Subaru's have higher rated alternators, will any of them drop into a sf? The more expensive aftermarket offerings aren't an option due to $.
Did you consider that it might be more cost effective to switch to LED lights rather than doing the alternator upgrade? IMHO I can't see buying new lights with old and inefficient technology.

GD
 

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Super Moderator
2001 Forester S, 4EAT
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There's no way it needs almost 90 to function. The stock alternator is only rated to 75, and once alternators heat up they lose 15%ish. I think with 110 rated from the 05 legacy I'll be alright, or I hope so at least, cause I can't afford anything more expensive.
Stock 75Amp + your new lights at 60Amp + extra 10Amp overhead = 145Amps, good luck with the 110Amps.
 

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2001 L auto
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Discussion Starter · #9 ·
@Green Darter these new lights are led. I measured them @ 120w each, they're the arb intensity knockoffs. The nice thing about the 500's with the high watt bulbs is how easy it is to change a bulb, and the bulbs are 7.50/ pair. Its hard to get leds that match them for distance especially with 4 of them together.
 

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2015 Forester CVT
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@Green Darter these new lights are led. I measured them @ 120w each, they're the arb intensity knockoffs. The nice thing about the 500's with the high watt bulbs is how easy it is to change a bulb, and the bulbs are 7.50/ pair. Its hard to get leds that match them for distance especially with 4 of them together.
Nice thing about LEDs is there are no "bulbs" to change, nor a need to change them if quality is good.
 
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