# WTB - 99-01 90 Amp Alternator w/ Plug & Wires **URL:** \ **Category:** Member Listings (Parts & Vehicles)\ **Tags:** wanted\ **Created:** [September 12, 2026, 10:55pm UTC](https://forum.isuzunation.com/t/wtb-99-01-90-amp-alternator-w-plug-wires/312 "2026-09-12T22:55:22Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![RealJon](https://forum.isuzunation.com/letter_avatar_proxy/v4/letter/r/8e7dd6/32.png) [@RealJon](https://forum.isuzunation.com/u/RealJon)\ **Post date:** [September 12, 2026, 10:55pm UTC](https://forum.isuzunation.com/t/wtb-99-01-90-amp-alternator-w-plug-wires/312/1 "2026-09-12T22:55:22Z")
Looking to get a 99-01 90 Amp alternator with the wiring. The plan is to splice the new alternator into my existing system and replace the factory 40 or whatever amp. This is for a 2.6 91, so correct me if I mis understand what the hell I’m doing . ---
**Author:** ![EdMc34ZuZu](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/edmc34zuzu/32/32_2.png) [@EdMc34ZuZu](https://forum.isuzunation.com/u/EdMc34ZuZu)\ **Post date:** [September 12, 2026, 11:43pm UTC](https://forum.isuzunation.com/t/wtb-99-01-90-amp-alternator-w-plug-wires/312/2 "2026-09-12T23:43:57Z")
Rockauto has a selection of reman’d and new 90-amp alternators. Here’s their listing for a 2000 Trooper: > **[2000 ISUZU TROOPER 3.5L V6 Alternator / Generator | Shop Now at RockAuto](https://www.rockauto.com/en/catalog/isuzu,2000,trooper,3.5l+v6,1363272,electrical,alternator+/+generator,2412)** > > Electrical Parts and More for Your 2000 ISUZU TROOPER at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty. You’ll also have to deal with the lack of an “L” winding in the 90-amp alt. I don’t imagine there would be one of those in that one. The “L” winding in an OE 2.6 alt is separate from the main winding and sends voltage to the main engine relay to shut it. If you don’t have that, the engine ain’t gonna run. A while back I worked out a means of bypassing the “L” winding, by substituting a switched power source for the “L” winding, and running the grounded side of the main relay coil thru an oil pressure switch. This gives some protection to the circuit, and if the engine stops, the PS opens up, turning off the fuel pump. Rather than re-hash that here, I’ll post a link to the thread on Planet Mordor where the info resides: > **[Potential Issues Using Ecoflow Charger - 91 Trooper](https://www.planetisuzoo.com/threads/potential-issues-using-ecoflow-charger-91-trooper.159062/?post_id=5620256#post-5620256)** > > Your experience is better when members know exactly what vehicle you drive | As I move everything from my 4Runner set up to the Trooper, I am getting ready to remove the ecoflow alternator charger over so I can get my battery mounted & wired up.... But I will post the diagram here, hope that helps…ed ![Ed's I-TECH L-Winding Bypass Mod 001](https://forum.isuzunation.com/uploads/default/original/1X/25fd150397ec29c2c5052408708bf36a6d0f22d4.jpeg) ---
**Author:** ![RealJon](https://forum.isuzunation.com/letter_avatar_proxy/v4/letter/r/8e7dd6/32.png) [@RealJon](https://forum.isuzunation.com/u/RealJon)\ **Post date:** [September 12, 2026, 11:55pm UTC](https://forum.isuzunation.com/t/wtb-99-01-90-amp-alternator-w-plug-wires/312/3 "2026-09-12T23:55:03Z")
Yeah, I was going to do the rework but I’m 100% I’m going to screw it up. I found a post on the planet that said you can just change the plug and it works. > **[Easy alternator upgrade](https://www.planetisuzoo.com/threads/easy-alternator-upgrade.59068/page-2)** > > For those of us with 60 or 70 amp alternators, I just installed unit from 99-02 Trooper (100 amp I believe). It is a much beefier unit and it bolted in the same brackets and used the same length belt (just use the inner 4 grooves on the pulley). I... I just want to pay someone to fix this shit for me so I can enjoy the vehicle. I’ve asked on Facebook and asked around locally but no bites. Someone just take my money . ---
**Author:** ![EdMc34ZuZu](https://forum.isuzunation.com/user_avatar/forum.isuzunation.com/edmc34zuzu/32/32_2.png) [@EdMc34ZuZu](https://forum.isuzunation.com/u/EdMc34ZuZu)\ **Post date:** [September 13, 2026, 12:12am UTC](https://forum.isuzunation.com/t/wtb-99-01-90-amp-alternator-w-plug-wires/312/4 "2026-09-13T00:12:19Z")
Be sure to read Tad’s comment (#20) about the “L” winding issue. It’s not just changing the plug, if you don’t create a substitute for the voltage coming from the “L” winding, the engine ain’t gonna run! > **[Easy alternator upgrade](https://www.planetisuzoo.com/threads/easy-alternator-upgrade.59068/?post_id=660523#post-660523)** > > Your experience is better when members know exactly what vehicle you drive | For those of us with 60 or 70 amp alternators, I just installed unit from 99-02 Trooper (100 amp I believe). It is a much beefier unit and it bolted in the same brackets and... He suggests adding a relay. Which is possible. But that provides no protection for the fuel pump if the engine quits. That’s what the pressure switch is for. You could simplify the process by putting a pipe “Tee” in the hole where the oil pressure Idiot light switch resides. Then you can run the originial ZuZu switch for the Idiot light circuit, without having to mess with it at all. And also be able to run the V6 oil pressure switch to power up the engine relay.