BaKed Posted December 1, 2009 Report Share Posted December 1, 2009 (edited) hey guys been a long time since i have made a post....well i am having the same problem i was having with my 79 620....i replaced my alternator and my battery and my charging system is still not working....i ran a new ground to my battery and pulled the positive off and my truck still dies....my voltage reg is internal so my alt passed when i started seeing the problems again after about two weeks of repair....i am completely lost about this and if i can figure it out soon i am gonna be posting my truck for sale....plz help me thats my last resort.....and if anyone might have had the same problem plz gimme some info on what you did....i cant figure this shit out Edited December 7, 2009 by datzenmike different title Quote Link to comment
datsunaholic Posted December 1, 2009 Report Share Posted December 1, 2009 Where are you getting the alternators? I found that most of the "lifetime warranty" Kragen or Autozone alternators had a 75% DOA rate. Of the remaining 25%, most of those lasted less than 6 months. I had one last a couple years... And yes, many of those "tested" good. Also... In one odd case it turned out that I had no connection between the battery and alternator- the wire was broken in the harness. It would READ OK unloaded, but with any load it was essentially an open. Quote Link to comment
banzai510(hainz) Posted December 1, 2009 Report Share Posted December 1, 2009 charge the battery then put a volt meter on there!!!!!!!!!!!!! then tell us what its doing. Quote Link to comment
slam_dat_sun Posted December 1, 2009 Report Share Posted December 1, 2009 Um if I was baked I would be lost to :lol: Quote Link to comment
Bob3 Posted December 2, 2009 Report Share Posted December 2, 2009 Inappropriate Title! That is not needed here! Quote Link to comment
slam_dat_sun Posted December 2, 2009 Report Share Posted December 2, 2009 Inappropriate Title! That is not needed here! Bob I was thinking the same thing but wasn't going to say nothing ......... Quote Link to comment
lynchfourtwenty Posted December 2, 2009 Report Share Posted December 2, 2009 the guys upset.. lets look past the title.. :D anyhow i would double triple check the wiring, i had a problem for a long time where i could only drive in the day, if i turned the head lights on my battery died.. turned out i just had some crappy connections, cleaned em up an i was fine.. dont let it get to ya man.. you'll figure it out.. Quote Link to comment
rollinlow Posted December 2, 2009 Report Share Posted December 2, 2009 Is your fan belt tight, might be slipping? Quote Link to comment
BaKed Posted December 3, 2009 Author Report Share Posted December 3, 2009 hey guys an update for you....so i spliced a spare wire into the output of my Alternator....this means i bypassed my voltage regulator....i know this isnt rly safe but its getting me from point A to B....i run my stereo electric fan and headlights so i can keep the battery from overcharging....any suggestions on why this works....also if you have an spare wiring harnesses that would be a plus 2 Quote Link to comment
datsunaholic Posted December 3, 2009 Report Share Posted December 3, 2009 How can you bypass the regulator? It's internal to the alternator, per what you said and the year of the truck. No way to bypass it. Is it possible you have a non-regulated alternator in the truck, which is supposed to have one? If it's overcharging AND it's internally regulated, the internal regulator is blown. Had that happen, and yes running the headlights kept the voltage down. One sure fire way to destroy the internal regulator: Disconnect the battery when it's running. Quote Link to comment
Cuts metal like mad Posted December 3, 2009 Report Share Posted December 3, 2009 If your regulator is bad... this may sound strange. Replace it. Quote Link to comment
Suspect Posted December 3, 2009 Report Share Posted December 3, 2009 on my 77 620, someone hooked the wires backwards on my altinator. After I bought the truck, I swapped the wires on the altinator and started to drive it. Lights were super bright.... I didn't realize that I was getting 17+ V out of it until the battery started to smell like a septic tank. I put a new voltage regulator in it and it started to work right. On all 3 of my running 620's, I've had a loose belt cause charging issues. Quote Link to comment
Skib Posted December 3, 2009 Report Share Posted December 3, 2009 Im having the same problem with my 510 wagon, L16 with a 280ZX IR alt. and still no luck :blink: Quote Link to comment
lynchfourtwenty Posted December 3, 2009 Report Share Posted December 3, 2009 check the wiring guys... or run new wires where applicable.. Quote Link to comment
Skib Posted December 3, 2009 Report Share Posted December 3, 2009 check the wiring guys... or run new wires where applicable.. Iv been cleaning all my connections and still no go, Im gonna have to replace all the alt wiring in the harness I think but I gotta get that 5 speed outa here first :rolleyes: Quote Link to comment
lynchfourtwenty Posted December 3, 2009 Report Share Posted December 3, 2009 my truck sat for months because it wouldnt charge.. i thought i tryed everything, 2 alts a new reg.. when it came down to it, it just needed a few new connectors crimped on an the wires cleaned up a bit... Quote Link to comment
Skib Posted December 4, 2009 Report Share Posted December 4, 2009 ya I know its a connection somewhere cuz itl be dieing and the lights will be super super dim, I hit a random bump and they brighten right back up :rolleyes: Quote Link to comment
lynchfourtwenty Posted December 4, 2009 Report Share Posted December 4, 2009 have you checked to see if its got a draw or something? maybe groundin out somewhere.. this might sound funny... check your head lights.. my problems all started because of one of the connectors on one of my head lights snapped off an it would cause a draw, which killed my alt and or volt reg.. Quote Link to comment
Skib Posted December 4, 2009 Report Share Posted December 4, 2009 my headlights are on relays if that makes any difference? Quote Link to comment
lynchfourtwenty Posted December 4, 2009 Report Share Posted December 4, 2009 i dont know? mine are stock.. one of the little prongs on the bulb itself had broken where it plugs into the harness, an it grounded out.. Quote Link to comment
Skib Posted December 4, 2009 Report Share Posted December 4, 2009 thanks for the suggestions Josh :fu: Im running out of ideas, Ill go check it out. this problem gets old real fast :rolleyes: Quote Link to comment
lynchfourtwenty Posted December 4, 2009 Report Share Posted December 4, 2009 i know man, i been there.. shit like this sux, you'll figure it out tho.. im jus tryin to throw some shit out there, i've seen stranger shit happen.. Quote Link to comment
rollinlow Posted December 4, 2009 Report Share Posted December 4, 2009 I bet your fan belt is loose or worn out, 90% of the time this is the problem in your case at my work (im an auto electrician) Quote Link to comment
Skib Posted December 4, 2009 Report Share Posted December 4, 2009 I bet your fan belt is loose or worn out, 90% of the time this is the problem in your case at my work (im an auto electrician) I wish it was worn out, brand new unfortunately Quote Link to comment
lynchfourtwenty Posted December 4, 2009 Report Share Posted December 4, 2009 you take a voltmeter to it yet? Quote Link to comment
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