beatngu Posted July 10, 2017 Share Posted July 10, 2017 So I got myself a delco 22si hp and was curious how to hook her up. Should the voltage regulator be changed from the old generator or do I even need it? The alternator has 4 terminals battery, ground, R and a blank one. Quote Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/ Share on other sites More sharing options...
Lmackattack Posted July 10, 2017 Share Posted July 10, 2017 First question is this a internal regulated unit or a non regulated unit. ? I think the 22si could be had both ways. Most people today buy internal regulated as its less wireing. if it is internal regulated you just need a thick red wire from the unit to the + side of the battery and a good ground wire to the block or frame. if you start the truck and voltage stays 14.5 or less you are good. if it is above that it likely needs a external regulator. Still Best to find out before. The "R" puts out 1/2 the voltage used for other stuff that you likely dont have. one other thing is some units need to see RPM before they start charging. so after you fire it up give it some RPM to excite it. Quote Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/#findComment-374535 Share on other sites More sharing options...
beatngu Posted July 10, 2017 Author Share Posted July 10, 2017 I am not terribly certain if it is internally regulated. I will have to try your suggestion and watch voltage, would I have to run a separate wire to the voltmeter? Quote Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/#findComment-374570 Share on other sites More sharing options...
Lmackattack Posted July 10, 2017 Share Posted July 10, 2017 1 hour ago, beatngu said: I am not terribly certain if it is internally regulated. I will have to try your suggestion and watch voltage, would I have to run a separate wire to the voltmeter? if its a simple 2 wire set up..... from the back of the unit just run a wire from the + post over to the battery then attach a ground wire to the frame or block. after the truck starts give it some rpm and then use the volt meter to check voltage at the battery. On my R model I am seeing 13.5 to 13.7 at my batterys and about the same on the dash gauge Or just run it over to a electrical shop and ask them what they think. I know the 22SI had different options how they were equipped. Quote Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/#findComment-374582 Share on other sites More sharing options...
41chevy Posted July 11, 2017 Share Posted July 11, 2017 (edited) Here is the official Delco wire diagram for a one wire alt with gauge, Ground wire from alt to chassis isn't shown My Delco books show 21SI and 22SI are both internal regs.Two wire plug from the top is internal reg, plug from the back is external reg. Edited July 11, 2017 by 41chevy Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/#findComment-374602 Share on other sites More sharing options...
beatngu Posted August 6, 2017 Author Share Posted August 6, 2017 Update everything is wired and appears to work properly. Now all that is left is get a new window cut, tires and weld up the gas tank 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/#findComment-376780 Share on other sites More sharing options...
Maddog13407 Posted August 7, 2017 Share Posted August 7, 2017 think when I did mine I went the cheap route and tossed the voltage regulator, kept the ground wire to it to the cab and bolted the other two wires together and taped them. ran a good ground from alternator to the block and hooked up the hot to the hot. Quote Link to comment https://www.bigmacktrucks.com/topic/50427-how-to-wire-delco-22si/#findComment-376836 Share on other sites More sharing options...
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