sycloned916 Posted September 17, 2008 Report Share Posted September 17, 2008 My alternator on my 520 is going out,the stock one puts out 35amps. Is there an alternator with more amps that will work for my little 520. Thanks! Quote Link to comment
ppeters914 Posted September 17, 2008 Report Share Posted September 17, 2008 Although I've never seen a specific post about upgrading the alternator on a J-series motor, I cannot see why the many posts on upgrading alternators on L-series engines to GM or Saturn alts wouldn't apply. From the How-To section: 90 amp bolt in alternator on an L-series motor Quote Link to comment
sycloned916 Posted September 17, 2008 Author Report Share Posted September 17, 2008 Just got done reading all that think i might just go with a chevy 1-wire.They weren't to clear on how to hook it up to a 520 for the 90amp alt. but i did find some of it useful. Quote Link to comment
slodat Posted September 17, 2008 Report Share Posted September 17, 2008 You will have to fabricate a bracket to use the chevy one wire. Quote Link to comment
ppeters914 Posted September 17, 2008 Report Share Posted September 17, 2008 No, there aren't any step-by-step instructions for a J13 in a 520, but the basic process is the same for nearly all vehicles. Quote Link to comment
slodat Posted September 17, 2008 Report Share Posted September 17, 2008 It's pretty much the same on all dattos. You just have to make sure there is room for the bigger alternator case and you have means to adjust belt tension. Quote Link to comment
sycloned916 Posted September 17, 2008 Author Report Share Posted September 17, 2008 Ya, i have plenty of room just went to go check,My alt has about 6 wires off it,ground and batt. and a plug of 4. The chevy alt wont be too hard to put in,i can fab something up easy. Quote Link to comment
ppeters914 Posted September 17, 2008 Report Share Posted September 17, 2008 The plug most likely goes to the external regulator. The newer alt will be internally regulated, so you won't need that. You can run new wires or run jumpers off the wires to by-pass the regulator. I know that's been posted here before. I ran new wires on my roadster when I converted it. Long-term, I'm gonna shitcan the crap butchered wiring and replace it with an EZ Wiring harness. You might be the first oh-fish-all documented case of upgrading a J-series engine alt. Take some pics and document it. :thumbup: Quote Link to comment
datzenmike Posted September 17, 2008 Report Share Posted September 17, 2008 I doubt it puts out 35amp, the '78-'80 L20B 620 and early 720 were only 27.5 and 30 amps. ANYTHING would be an improvement though and this is a really good idea. You'll love it! Faster wipers and heater fan and brighter lights. Quote Link to comment
ppeters914 Posted September 17, 2008 Report Share Posted September 17, 2008 I doubt it puts out 35amp, the '78-'80 L20B 620 and early 720 were only 27.5 and 30 amps. Really? I had the alt tested from my '77-'78 L20b (donor car unknown). It was putting out 50A, so I decided to upgrade to a Saturn alt later. Quote Link to comment
slodat Posted September 17, 2008 Report Share Posted September 17, 2008 as long as there is room for the case of the alternator, a '93 saturn alternator will pretty easily bolt in place of a stock alternator. i did a write up on it either here or nwde. it's pretty straight forward. it's a GM CS-130. Quote Link to comment
sycloned916 Posted September 17, 2008 Author Report Share Posted September 17, 2008 Now i'm looking at the saturn alt. not too sure on which one now,but i'd rather have more amps. Last winter when it was raining my wipers were moving as fast as my truck goes on the freeway.Not fun to drive in. I will take pics when i do find a alt that i like the GM 1-wire or the CS-130 alt. I'll probly try to find your write up slodat and do some reading on them first before i start to tear it up. Quote Link to comment
Jason Posted September 17, 2008 Report Share Posted September 17, 2008 If size for a IR alternator is a problem there are a couple of options sticking with Nissan/Datsun stuff. The 50 amp IR alternator has 2 case sizes, one being smaller (5" diameter, 10lbs) and the other being the barrel diameter as the 60 amp one (about 5.5", 11 lbs). The forklifts, H20?, uses a smaller IR alternator in 35, 40 and 50 amps (4.5" barrel diameter, 8 lbs). Notice the forklift one has an internal fan for less drag too .... L-R 60 amp, 50 amp small body, 50 amp forklift EDITED WITH DATA & PICTURES ADDED. Quote Link to comment
sycloned916 Posted September 18, 2008 Author Report Share Posted September 18, 2008 Just pick'd up a Delco-Remy alt. 7860-11,seemed to fit pretty good.Won't start putting it in till after the sac meet. Where would i connect the two wires that come off the alt. I know the power goes to the nut that's there,but there are two plugs on the alt that i'm not too sure of.I'll keep reading the how-to but cant seem to find it. Quote Link to comment
slodat Posted September 18, 2008 Report Share Posted September 18, 2008 There are three wires: The main +12v output - the stud on the back. Heavy gauge wire to the battery or starter. The two wire connector: 1 or R - a lamp is wired in series with a switched voltage source. During normal operation the lamp stays off. If the regulator is damaged, the 1 terminal provides ground, and the warning lamp will light. This terminal is also active on 1 wire regulator equipped 10SI alternators. 2 or F - Field/Sense Terminal. (Marked with a 2 and F on case) This terminal is used to excite the 10SI into operation. It is connected to the battery positive. For simplicity you can connect the 2 connector pigtail directly to the BAT terminal on the alternator. Quote Link to comment
sycloned916 Posted September 18, 2008 Author Report Share Posted September 18, 2008 Ok. One is white and the other is black.So the white one would got to 12v switched and the black to the output on the to the batt? Quote Link to comment
ppeters914 Posted September 18, 2008 Report Share Posted September 18, 2008 The first four links on this page discuss installing the GM alternator with pics: http://www.311s.org/pmwiki-311/pmwiki.php?n=TechSection.Electrical Lemme know if you need better pics as I did this on my roadster. A real no-brainer. :D Quote Link to comment
datzenmike Posted September 18, 2008 Report Share Posted September 18, 2008 Really? I had the alt tested from my '77-'78 L20b (donor car unknown). It was putting out 50A, so I decided to upgrade to a Saturn alt later. Maybe it had a Z car one on it? My '78 620 had 30? amp I put a 720 alternator on it 60 amp but it was much bigger around and was close to rubbing the idler arm grease nipple when the belt was worn. Quote Link to comment
sycloned916 Posted September 18, 2008 Author Report Share Posted September 18, 2008 Thanks! Thats just what i was looking for.I'm more of a picture person,but that is perfect.I'll take pic's when i swap it out for the delco-remy alt. Quote Link to comment
sycloned916 Posted September 23, 2008 Author Report Share Posted September 23, 2008 Thinking this was going to take a day to do,took me about 25-30min to install and back running. Everything fit like it's was made for it. GM harness with 50ohm resistor wired in. Alternator with harness ready to drop it. Back shot! Side by side. Same. Mounted it stock bracket,only had to cut the adjuster bracket for tension. Adjuster bracket. Done and wired up! Just have to start it. 14.59volts at idle from the 35amp, 12.20v stock alt. Quote Link to comment
slodat Posted September 23, 2008 Report Share Posted September 23, 2008 Nice work. I've never seen a J13. I had assumed they had the same straddle mount alternator all of the other datsuns and nissans I have seen use. Quote Link to comment
sycloned916 Posted September 23, 2008 Author Report Share Posted September 23, 2008 Ya, I was thinking i was going to have to fab up some brackets and buy alot of hardware to install it. I just had to use a longer bolt for the alt. adjuster bracket. Quote Link to comment
ppeters914 Posted September 23, 2008 Report Share Posted September 23, 2008 Excellent, and thanks for the pics. I'll point folks to this thread. Quote Link to comment
sycloned916 Posted September 24, 2008 Author Report Share Posted September 24, 2008 Everyone like's to look at pic's,I know i do. I must have read about 10 pages of info about the GM alt. and different wire diagrams before i installed it. Thanks! Quote Link to comment
sdsurf Posted September 29, 2008 Report Share Posted September 29, 2008 good pics :lol: mungo like... Quote Link to comment
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