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guys I had to can my Chinese delco from spidermarine. I wound up buying a leece-neville from a big rig shop. I even visited some local fire dept's and to see what they are running too.(leece-nevilles) so I got it on but used a 2 1/2" pulley vice a 3" pulley and used my same original belt. here...

74m35a2 holy crap! it even says on the papers with it that it was tested prior to shipping out and has "NEW DELCO" on the sales receipt too. but not on the unit. thanks again for all the assistance . I will follow up with this when I get it resolved V/r

74m35a2 and Manders thank you both for the responses and support on this little venture! my install went well except for this little electrical issue, I will get to the bottom of it. but for now I added some pics for you guys hopefully I can contribute back to others who do this. if I missed...

74m35a thanks again for the replies! I got the 21si alternator from spidermarine. it is 2 wire and I have 2 hooked to it.... a ground and one directly from the battery hot the other 2 are for indications only per them. as soon as I get home from work I will do your recommended actions and...

guys I did my install and it is awesome....but I still have the problem that prompted me to do this install. when the engine is running at idle the voltmeter on the dash is in the high yellow range and when I increase the idle it can go all the way into the red and then the meter starts to...

74m35a2 thanks again for the reply! I got to the bottom of it, when I called them twice this morning they asked me to call back because they couldn't find the pulley data. so about and hour later I get a call from them and it was the actual service guy and he promptly said we got the pulley...

All ok I called spidermarine and I gave them the above pulley data and they still cant find it. does anyone have the latest part # for the 8 groove serp pulley for the 21si that you can provide for me? thanks to all

74m35a2 thank you also for the reply and the recommendations , I already checked batteries they are good along with other basic simple check first items. Was it your posting about the part # ?. I referenced you in the above discussion, I had written the # down but not your name, but that...

manders thank you again for the reply! I think it looks great by the way! I cant wait to do mine, burning up my second alt after just 1000 miles was the icing on the cake to do this mod too! V/r

thank you for the reply. I will post some pics when I am completed. I found another posting that gave a good part # for another alternator mount that will accept the 21si. i am going to give it a try too. I called my local Cummins dealer and gave them the number and they had to order it from...

all I have just burned up my second military 60 amp alternator. I am ordering my new 21si tomorrow , so just for my clarification of the above posts, the 2 small wires don't need to be hooked up? only the pos and neg need hooked up. if I am incorrect here, any and all input would be greatly...

hello from Seattle, I know you posted this a while ago, but I own an m923a2 and was wondering how the alternator set up is still working for you? I called spidermarine today and they said they didn't know how it was producing 12 volts from terminal "r". but the guy I spoke to was pretty ****...