External 620 alternater

[720nut 4,225]

Hey guys I know this has been done several times but thought I would do my own. Here are several pics as I get started. I have a hub pullry for hydraulic pump as this is going to be a dedicated loader tractor

pretty tight quarters

empty area largest lawn battery I could buy

 

Edited July 8, 2021 by PhanDad
removed extra pics

[720nut 4,225]

alternater and pulley

 

Edited July 8, 2021 by PhanDad
removed extra pic

[720nut 4,225]

hub and pulley still needs welded

sorry for the mutiple posts it scripted me out. I will continue to post pics as I go

 

Edited July 8, 2021 by PhanDad
removed extra pics

[fishnwiz 3,290]

Ingenious!

[720nut 4,225]

A couple more pictures as we progress

Have decided that I need 1/2in belt 17 in long of course this will probably change as I go

 

Edited July 8, 2021 by PhanDad
removed extra pics

[isetta 50]

Sweet, how does the new pulley adapter key into the shaft and not spin?

[720nut 4,225]

Isetta ,will have to put in mill and cut small keyway in pulley hub. Large pulley has 3/8 key but I believe I only need 1/4 key for alternator.Could probably drill small hole for say 1/4in. pin and a hole in end of crankshaft to hold it from turning, I chose the key and tacked it in place to hold it We've been up north this weekend so tonight I'll get back to it.

[tadams 988]

What is that alternator off of?

[720nut 4,225]

Almost there a few more hours and contact time.

Alternator came off Ebay, I just searched mini alt and first one that came up.

 

Edited July 8, 2021 by PhanDad
removed extra pics

[BLT 718]

Nippon Denso 12V 35 Amp

[720nut 4,225]

Thanks Bob, I'm not good at remembering the critical things I just buy and make work.

Anyone know what gauge wire from alt to battery should be?

[Ronald Hribar 105]

being so close you could use battery cable

but are you going to run it thru ammeter ?

and ignition switch ?

[BLT 718]

Well now you have to go back to your E-bay purchase to find out the output and if it is a one or three wire hook up. It could go up as high as 70 amps. From alternator to battery as shown, a stub 4 ga should suffice with 70 A and a stub of 10 ga should be ok for 30 amp. Either way I would install voltmeter in lieu of your ammeter and run your signal wire from ignition switch. Also you can remove ammeter wiring.

[720nut 4,225]

Other than wiring it's finished.

Bob do you have a diagram of what your referring to? I hope this helps others who are considering it.Mini Chevy Denso Alternator 1 wire small one wire new 70amprotation; CWregulator;I/R amperage;70amp voltage;12-14.7 voltpulley;V-1 pulley

 

Edited July 8, 2021 by PhanDad
removed extra pics

[BLT 718]

I don't have a wiring diagram for voltmeter. There should be one in the box. All you need to do is tap into ignition wire to coil for power and run a ground wire where indicated.

[isetta 50]

Lookin good Lloyd, thanks for sharing your build.

[midnightpumpkin 83]

Lloyd

How about showing a little more detail on your tensioner bracket.

I used 10AWG wire with a 30 amp inline fuse.

John U

[720nut 4,225]

John I'll post pics but pretty simple. just a 1/4 X 1.5 angle bolted to frame and 3/16 X 1in. flat bar slotted on alternator end for adjustment very simple.

Sorry they came out a little dark but I believe you can get the idea. Used it last night to dig potatoes till it died,seems timing moved so next step to put electronic ignition on, just doesn't want to leave shopDidn't realize but belt stopped right with part # in veiw

 

Edited July 8, 2021 by PhanDad
removed extra pics

[720nut 4,225]

Several have been asking so thought I'ld repost

[coggonobrien 0]

did you tie into the wiring for the original system or just keep it completely separate except for the 12v sensing wire

[isetta 50]

David, welcome to the site

[tadams 988]

see ya found the post.

[Simplicity7013H 95]

This is very neat Lloyd! Some day, I hope to get a PowerMax some day. There was one close by for $1800 with cab, plow and deck. Sold before I could get to it.

[720nut 4,225]

That price with a cab it wouldn't last long. Just bide your time the right deal will come alongdOd

[jlasater 285]

Folks with Datsun Roadsters who upgrade the charging system like to use Subaru Justy alternators. They are very small. Might be another option.