JDMClassic Posted September 7, 2014 Report Share Posted September 7, 2014 Hello ratsun family! I was at a junk yard here in San Diego and I was wondering and I spotted a 720 with the alternator still in tact. I was wondering if the alternator from a 720 can fit and work on a 620? Tried researching and nothing can up. The junk yard closed while I was trying to take it out. The alternator looks a little different than the one I have on my 620. I should of took a picture or it! I'll be sure to come back tomorrow. Quote Link to comment
laotsu Posted September 7, 2014 Report Share Posted September 7, 2014 what year 720, more to the point what engine was in the 720? Quote Link to comment
datzenmike Posted September 7, 2014 Report Share Posted September 7, 2014 A 720 alternator is internally regulated and electrically will only work on a '78 and '79 620 that is wired for them. The '72-'77 620 are externally regulated but can easily be converted for use with an internal regulated alternator. The 620 is 35/38 amps. The 720 is at least 50 and optional 60 amps. It's larger and does not clear the 620's idler arm very well. I got one to fit 15 years ago by using a 280z lower rad inlet, it sweeps back more and moves the rad hose away from the top of the alternator. I also used the 720 mount to the engine. I think it lifts the alternator up slightly away from the idler arm. I used a shorter belt. Still had to mount the belt on the pulley first and then bolt it on. It worked.... barely Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.