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You need to replace battery cable: It's 8AWG from factory with your 100A Denso Alternator But if you ever need to replace it you may upgrade with aftermarket/Denso (OEM brand but cheaper if it doesn't say Toyota) Alternator which would likely be 125A-135A instead of 100A like factory. If you get a Aftermarket one that's 125A + then get 4AWG, I'll link both: 8AWG copper Alternator charge cable: https://www.ebay.com/itm/132670128341 On options select: Red, 5/16" lugs, 4 Foot. Your factory cables has a 1/4" bolt(4mm) and other side has 5/16"(8mm), you can't get both end different without paying crazy prices like an actual alternator charge cable for Toyota $71-$140. This cable I linked is $8 + $4 shipping. 4AWG Cable: https://shop.advanceautoparts.com/p/deka-switch-to-starter-battery-cable-fits-up-to-3-8-stud-red-4-gauge-04276/50163448-P $12 for a 4AWG with 3/8" lugs it will fit. If one side nut/bolt is too small get a steel washer and make sure to sand it. You should cover connections, bolts, lugs with Di-Electric grease after tightening. Here's an Alternator for replacement if needed: Part Number on Rock Auto: TYC 213806 $121 100A can use factory size 8AWG https://www.rockauto.com/en/catalog/toyota,2002,sienna,3.0l+v6,1388932,electrical,alternator+/+generator,2412 Here's a (Refurbished) OEM Denso/Toyota Alternator: https://www.ebay.com/itm/377030540860 Fitment and Quality ChecksPart Number Match: The listed interchange part number 101211-7670 directly replaces the original Denso / Toyota OEM core assembly numbers (27060-0A040, 27060-0A030, and 13806). Physical Anatomy: The casting structure matches, showing the offset mounting holes, the top adjustment ear, and the standard black front serpentine drive pulley. Seller Reputation: The merchant currently holds a highly trustworthy 99.8% positive feedback rating on their profile. Check Warranty section and if necessary get the 1-2 year extended warranty for $20 by Allstate. This OEM Refurbished Denso Alternator is only $99.90 If you get it from a Denso parts supplier you will be paying $120 refurbished + $75 core charge until you send them the old one back which costs $60+ for shipping to get the $75 core charge back. So essentially you would pay: $195 for same Denso Alternator that's Refurbished. AGS Dielectric Grease to prevent corrosion and more breaking wires. Cables, bulbs, connectors in the future: https://www.walmart.com/ip/2875221343?sid=81392d96-5e2c-4b24-ab23-06e7f12653f3