jfz80
Cruisin’
I am having charging issues after a siezed alternator on our club trip to the beach.
Some history:
+1977 fj-45; TBI 350 conversion 12 yrs ago, not by me or PO
+Bought 6mos ago (as is) and put 2800 issue free miles on it
+Was just in shop for floor repairs (ie welding was done on truck)
+When picked up ran 10-15* warmer than before work completed but under 210 (minor detail referred to later)
also put another 800 miles after work and before issue
Trouble begins:
+2hrs into drive to beach, stop for gas, alternator seizes and burst into smoke 100yrds after leaving gas station.
Done so far:
+replaced belt, and idler pulley with new, reman. alternator (advance auto)
+last 2hrs till battery is dead (think i got a bad reman)
+replace with another reman under advance warranty and all seems good for 2 days (aftermarket guage reads 14ish), until i begin to lose charge after beach driving (bouncy bouncy)
+Remove and clean batt>motor and motor>frame grounds, Add battery to frame and alternator to body grounds (cant hurt)
+replace alternator with another reman, NAPA this time
(all are delco remy remans) this alternator never did reach charge capacity even though bench tested before purchase and I made it home by borrowing and shuffling batteries-- thanks ONSC!!! HOWEVER as i say that it actually stayed at 10.8 for 30 minutes after install and then climbed to 19.2 volts over 90 seconds, stayed there for 30 seconds and dropped back to 10.8????
Test completed:
Battery voltage reads 12.3 with engine off
(from reading this correlates to a 60% capability to hold a charge, yet it tests good and does not qualify for replacement)
With engine running voltage reads 12.0 so I definately have some issue with this alternator as well.
Im hesitant to buy another battery or alternator before isolating the problem.
Thoughts:
+It is TBI and that is the only electrical draw on motor while running
+Could the initial meltdown have cause a spike and fried the charging circuits on the ECU ??
+According to GOOGLE i should have a CS130 alternator and further study reveals it is offered with two different volt regulators. Maybe i just keep getting the wrong reg??
+floating ground???? (ie break in wire)
+its got a positive lead to the back of the alternator and then the delco clip in plug with one female contact and wire leading to a power bus/terminal on the firewall (cleaned and reinstalled) Could this wire be the source of issues?
+picking a mechanics brain he mentions the GM had the idiot light in dash (cel) and that it was the resistor that allowed the excitor circuit to trigger the alternator and he metions if the bulb went out then the circuit was interupted. thoughts on that?
+if welding was performed grounded to frame could the current have screwed w/ my componetry. As mentioned above it ran warm upon picking up from body work but went straight to 185 after the first alternator replacement. could the welding have messed up alternator and caused drag therefore slowing water pump and causing warmer temps? i know a stretch but im out of ideas.
sorry for the long winded post, ask away and Ill try to provide more info. Thanks in advance
Some history:
+1977 fj-45; TBI 350 conversion 12 yrs ago, not by me or PO
+Bought 6mos ago (as is) and put 2800 issue free miles on it
+Was just in shop for floor repairs (ie welding was done on truck)
+When picked up ran 10-15* warmer than before work completed but under 210 (minor detail referred to later)
also put another 800 miles after work and before issue
Trouble begins:
+2hrs into drive to beach, stop for gas, alternator seizes and burst into smoke 100yrds after leaving gas station.
Done so far:
+replaced belt, and idler pulley with new, reman. alternator (advance auto)
+last 2hrs till battery is dead (think i got a bad reman)
+replace with another reman under advance warranty and all seems good for 2 days (aftermarket guage reads 14ish), until i begin to lose charge after beach driving (bouncy bouncy)
+Remove and clean batt>motor and motor>frame grounds, Add battery to frame and alternator to body grounds (cant hurt)
+replace alternator with another reman, NAPA this time
(all are delco remy remans) this alternator never did reach charge capacity even though bench tested before purchase and I made it home by borrowing and shuffling batteries-- thanks ONSC!!! HOWEVER as i say that it actually stayed at 10.8 for 30 minutes after install and then climbed to 19.2 volts over 90 seconds, stayed there for 30 seconds and dropped back to 10.8????
Test completed:
Battery voltage reads 12.3 with engine off
(from reading this correlates to a 60% capability to hold a charge, yet it tests good and does not qualify for replacement)
With engine running voltage reads 12.0 so I definately have some issue with this alternator as well.
Im hesitant to buy another battery or alternator before isolating the problem.
Thoughts:
+It is TBI and that is the only electrical draw on motor while running
+Could the initial meltdown have cause a spike and fried the charging circuits on the ECU ??
+According to GOOGLE i should have a CS130 alternator and further study reveals it is offered with two different volt regulators. Maybe i just keep getting the wrong reg??
+floating ground???? (ie break in wire)
+its got a positive lead to the back of the alternator and then the delco clip in plug with one female contact and wire leading to a power bus/terminal on the firewall (cleaned and reinstalled) Could this wire be the source of issues?
+picking a mechanics brain he mentions the GM had the idiot light in dash (cel) and that it was the resistor that allowed the excitor circuit to trigger the alternator and he metions if the bulb went out then the circuit was interupted. thoughts on that?
+if welding was performed grounded to frame could the current have screwed w/ my componetry. As mentioned above it ran warm upon picking up from body work but went straight to 185 after the first alternator replacement. could the welding have messed up alternator and caused drag therefore slowing water pump and causing warmer temps? i know a stretch but im out of ideas.
sorry for the long winded post, ask away and Ill try to provide more info. Thanks in advance