After more than 26 years, I'm finally a owner of a very nice, low mileage 1994 Honda ST1100 that was posted on this forum last month. The bike is in absolutely tremendous shape and the previous owner took extremely good care of it. After my 1700 mile trip home the OEM 28 Amp alternator died. I need to replace the alternator and after being a member of this group for about 2 years, it looks like I should upgrade to a 40 Amp alternator. Question: Where can I order all the parts necessary to make this happen? Are there any genuine Honda alternators for ST1100s still available? Does anyone know where I can buy this part? Thanks all for your help - I can't wait to start riding this bike again! Gregory Smith, MSgt, USAF (Retired)
1994 Honda ST1100 - 28 Amp Alternator Died; Need to Upgrade to 40 Amp Alternator
- Thread starter Banshee
- Start date
The 28 amp stator is now obsolete and not available through Honda. Some used ones come up on eBay. The parts for the 40 amp upgrade are all available through Honda (try Partzilla) and there is a kit for helping with the job available through this forum. John O. (on this forum) is the 'manager' of one such kit. Complete instructions also available through Mike Martin's ST pages.
http://koczarski.com/mmartin/Alt.htm
http://koczarski.com/mmartin/Alt.htm
Jonb
Red Arr00w
Get a good manual and follow the electrical test procedures. It might just be the voltage regulator. Upgrading the to 40 amp however is a great way to go as you can add many electrical farkles and heated gear.
There is a used 40 amp on ebay: http://www.ebay.com/itm/2002-02-Hon...ash=item3aefe8786e:g:Cb4AAOSw4i5ZrJ9j&vxp=mtr
Includes the drive parts needed to install. You could get this one and clean it up. You might want to replace the bearings and regulator before installing it as I did. Write up on that here: https://www.st-owners.com/forums/showthread.php?55159-Alternator-bearing-replacement
Friggin' Photobucket! Can't even download my own pictures! What a PITA!! I'll get this figured out so I can get the pictures back.
Includes the drive parts needed to install. You could get this one and clean it up. You might want to replace the bearings and regulator before installing it as I did. Write up on that here: https://www.st-owners.com/forums/showthread.php?55159-Alternator-bearing-replacement
Friggin' Photobucket! Can't even download my own pictures! What a PITA!! I'll get this figured out so I can get the pictures back.
I wouldn't try to follow the Honda Service manual to diagnose alternator - confusing!!
Agree... very confusing!
I cant find one on part zilla is it hard to retofit the 40 amp
Good morning/afternoon,
We regret to inform you that the 40amp alternator base plate P/N 11202-MAJ-G20 has had a part number change. It is no longer discoverable except under P/N un-obtain-ium. We hope that this helps you in the search for Elysium.
Regretfully yours,
Honda
If you have a modicum of mechanical skills and the tools to do the job, it isn't terribly difficult to do the upgrade. There is a kit with some necessary bits to do the job available for your use, free of charge except for postage. You need to contact John O. on this site, who is the keeper of the kit.
Also, do you have the Honda, or the Clymer Service manual for your bike? The Clymer has a pretty good description of the upgrade process. I'm going to look up some other links to reports of doing the job and will post them here shortly.
Linky to the job ahead of you.
40 Amp Alternator Upgrade - A Two Part Series ! Now With VIDEO !! *
40 Amp Alternator Upgrade - A Two Part Series ! Now With VIDEO !! *
www.st-riders.net
Fortunately, you can buy it with or without parts here:
Honda st1100 40 amp upgrade parts. no alternator 11202-maj-g20 | eBay
Find many great new & used options and get the best deals for Honda st1100 40 amp upgrade parts. no alternator 11202-maj-g20 at the best online prices at eBay! Free shipping for many products!
www.ebay.com
Honda P/n 11202-maj-g20 Adaptor Plate for 40amp Upgrade for sale online | eBay
Find many great new & used options and get the best deals for Honda P/n 11202-maj-g20 Adaptor Plate for 40amp Upgrade at the best online prices at eBay! Free shipping for many products!
www.ebay.com
If the 28A is obsolete, I can understand the upgrade. But if you upgrade to a 40A alternator, you are still running with a 20A electrical system. Wire sizing is not an issue?
kiltman
Site Supporter
- Joined
- Apr 27, 2013
- Messages
- 3,279
- Age
- 68
- Location
- Stratford, Ontario Canada
- Bike
- 2002,ST1100ABS
- STOC #
- 8826
Yes and no.
Each accessory will still draw the same wattage wether you have a 28 amp service or a 40 amp service and the OEM wiring is geared for that. The weak link is the wiring to the main relay and there are bypasses that can be employed to deal with that. As a result of a higher capacity that the 40 amp service can give you, more circuits can be added via either by an additional fuse block or individual fuses, using appropriate wire sizes for the wattage of said added accessory.
I up graded my '94 ST1100 from the 28 amp to the 40 amp last year. You CANNOT get the alternator base plate anywhere except from the fellow who is manufacturing them. I know, I searched for months. My advise to anyone thinking about doing the 40 amp upgrade, having just done mine,
1- buy this kit now. It has all the major parts you will need. It'll save you months trying to round up all the parts you need. https://www.ebay.com/itm/114859879844?_trkparms=aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=20200818142401&meid=0bb2a6a633d14a54a25ad358a2dc3339&pid=101124&rk=1&rkt=12&sd=114750827750&itm=114859879844&pmt=0&noa=1&pg=2563228&algv=DefaultOrganic&brand=Honda&_trksid=p2563228.c101124.m2109
2- Buy a new 40 amp alternator. Everyone wants a genuine Honda, but chances are they are chinese anyway. I actually got mine from walmart.com. https://www.ebay.com/itm/324358349320?_trkparms=aid=1110018&algo=HOMESPLICE.COMPLISTINGS&ao=1&asc=232958&meid=0fbc2f58d4964d4e950d6c549d3afa5f&pid=101196&rk=1&rkt=12&sd=114859879844&itm=324358349320&pmt=1&noa=0&pg=2047675&algv=ItemStripV101HighAdFeeWithCompV3Ranker&_trksid=p2047675.c101196.m2219&amdata=cksum:3243583493200fbc2f58d4964d4e950d6c549d3afa5f|enc:AQAGAAACAJ1xOIeTuwRjlAyhAOOBi4IQl8Mc1UPceyLbo0mrXLeJlqFtIhLeL6bYib2jLTc7xboukD8dhiGPCSqUnGG26au%2FCmk0nISHrNkqEH6TJRI6IQdK8bfMh0ScJOn0G61Jfbt5Ioa3uHbpTmKJeP%2F%2BFIKfyzIswNIQMwkgLHD8sbsuySoFA1U4Jw2c7lJ%2BEcWlyu0jVyefbk0cqIq%2B%2BMuxoUPOP%2BygLJJFFGzuoYd0u0TcrWwVOOqhLVtY%2Ftvisu9N4ZYR4hm4ys2lIc7KkH26n35mWUvy9OzHtkMCAcuM2scynCs0mXF53Mk3htfNPgeLdMJ%2BNF9tzUTD2y8eSeXwce%2FCJFYhBCnu74wLrP3y%2F0qvJ%2FeVVaQWxOEpLpzPIaZptR8IQFM808sIFiNnFwzUtvObRyGB%2BHsyr5UpwQIf8HqspBDj7NYnZPrXtopeaIo7apl8d5cxVHZBqtO6GEGjLc6GCfkZI05Bjh2n5RjgkhAvjrL7v19BuVUKI5YP97YDm4gH6948jldlhU9aij4iyMZoDOmebLT5BEcESQaqKsrvduu7oKJXP6%2FSwbDY4seQ5PBzllxZhoOXUDcpnWFt3vm3LcOCFqvQjjV%2BDPy%2B3vfGFcx29cBBlsOkpbdijtt0pZl5eReFE9r5vT6UNncXE2noaxidpdHeGGECB1xk2R3O|ampid
L_CLK|clp:2047675
3- Get with John Oosterhuis <GreyGhOOST@mchsi.com and get the traveling install kit coming your way. It has all the tools, instructions and just about everything you'll need to do the upgrade.
4- here's the write up I did on my install https://www.st-owners.com/forums/th...-alternator-upgrade-completed-woo-hoo.173478/
If I'd had this information before I started my install, it would have saved me months and a load of confusion and frustration.
1- buy this kit now. It has all the major parts you will need. It'll save you months trying to round up all the parts you need. https://www.ebay.com/itm/114859879844?_trkparms=aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=20200818142401&meid=0bb2a6a633d14a54a25ad358a2dc3339&pid=101124&rk=1&rkt=12&sd=114750827750&itm=114859879844&pmt=0&noa=1&pg=2563228&algv=DefaultOrganic&brand=Honda&_trksid=p2563228.c101124.m2109
2- Buy a new 40 amp alternator. Everyone wants a genuine Honda, but chances are they are chinese anyway. I actually got mine from walmart.com. https://www.ebay.com/itm/324358349320?_trkparms=aid=1110018&algo=HOMESPLICE.COMPLISTINGS&ao=1&asc=232958&meid=0fbc2f58d4964d4e950d6c549d3afa5f&pid=101196&rk=1&rkt=12&sd=114859879844&itm=324358349320&pmt=1&noa=0&pg=2047675&algv=ItemStripV101HighAdFeeWithCompV3Ranker&_trksid=p2047675.c101196.m2219&amdata=cksum:3243583493200fbc2f58d4964d4e950d6c549d3afa5f|enc:AQAGAAACAJ1xOIeTuwRjlAyhAOOBi4IQl8Mc1UPceyLbo0mrXLeJlqFtIhLeL6bYib2jLTc7xboukD8dhiGPCSqUnGG26au%2FCmk0nISHrNkqEH6TJRI6IQdK8bfMh0ScJOn0G61Jfbt5Ioa3uHbpTmKJeP%2F%2BFIKfyzIswNIQMwkgLHD8sbsuySoFA1U4Jw2c7lJ%2BEcWlyu0jVyefbk0cqIq%2B%2BMuxoUPOP%2BygLJJFFGzuoYd0u0TcrWwVOOqhLVtY%2Ftvisu9N4ZYR4hm4ys2lIc7KkH26n35mWUvy9OzHtkMCAcuM2scynCs0mXF53Mk3htfNPgeLdMJ%2BNF9tzUTD2y8eSeXwce%2FCJFYhBCnu74wLrP3y%2F0qvJ%2FeVVaQWxOEpLpzPIaZptR8IQFM808sIFiNnFwzUtvObRyGB%2BHsyr5UpwQIf8HqspBDj7NYnZPrXtopeaIo7apl8d5cxVHZBqtO6GEGjLc6GCfkZI05Bjh2n5RjgkhAvjrL7v19BuVUKI5YP97YDm4gH6948jldlhU9aij4iyMZoDOmebLT5BEcESQaqKsrvduu7oKJXP6%2FSwbDY4seQ5PBzllxZhoOXUDcpnWFt3vm3LcOCFqvQjjV%2BDPy%2B3vfGFcx29cBBlsOkpbdijtt0pZl5eReFE9r5vT6UNncXE2noaxidpdHeGGECB1xk2R3O|ampid
L_CLK|clp:20476753- Get with John Oosterhuis <GreyGhOOST@mchsi.com and get the traveling install kit coming your way. It has all the tools, instructions and just about everything you'll need to do the upgrade.
4- here's the write up I did on my install https://www.st-owners.com/forums/th...-alternator-upgrade-completed-woo-hoo.173478/
If I'd had this information before I started my install, it would have saved me months and a load of confusion and frustration.
Last edited:
For those who need to do this, is a suitable pin-on-a-leash part of the kit?
There's one in the kit. There's also a plastic tube to assist in threading the wire leash up through the drain hole. The kit has a single wire attached to the pin that broke when I did mine. Maybe used too many times? So I added a strand of picture frame wire ( I included a roll in the kit) to it then it worked fine.
wjbertrand
Ventura Highway
No single individual circuit is going to draw more amps with the 40A unit installed vs. the 28A unit. The beauty of the 40A unit is that it better handles multiple circuit demands including added accessories. It also has better output at idle and slower in-town speeds, something the 28A could not keep up with. My '93 ABS would start throwing an ABS code 8 in slow traffic as it could not handle the cycling of the cooling fan, brake light load and ABS system demands resulting in drawing down the battery. This was happening with no added accessories at all.
John OoSTerhuis
Life Is Good!
The link to all the STOC loaner tool kits (Link) and the one to the Alt Upgrade Kit (Link) [register]. Here’s a picture of some of the tools (the Lewis-Pin is #2):
This is the original pin made by Jon Lewis himself and donated to the ST community. Hardened steel slightly larger than 6mm and with a shoulder to fix the insertion depth. 170+ successful upgrades. The whole kit:
John
Last edited: