Discussion:
Alternator problem

I'm working on a Toyota 7fdu35 with a charging problem. Have had the alternator off twice and tested twice. Tested good both times. Even had them tear it down and inspect it but everything tested good. Put It back on and still no charging. All voltages going into the alternator are correct. Even jumped the excite wire manually and still nothing. Any suggestions?
  • Posted 14 Jan 2015 06:27
  • Discussion started by ben_d
  • Louisiana, United States
Showing items 1 - 6 of 6 results.
There are a large (50 amp?) alternator output and small (5-10 amp) voltage regulator fuses in the fuse box
  • Posted 16 Jan 2015 08:53
  • Reply by mrfixit
  • New York, United States
i'd check the output at the alternator output terminal first
you should have charge outout there... then probe through the charge wire going to the battery and see if there are any high resistance spots or if it has fuse links anywhere check those.

some of the C & P cat trucks had similar issues...
alternators would test good but still wouldn't charge at the battery and i found many times the fuse links were bad or had bad connections. Also if it has an emergency disconnect switch check that, the charge circuit probably goes through that too.

oh yeah... make sure you have a good ground from engine to frame... no ground might mean no charging.
Just a thought or two ;o)

good luck
  • Posted 16 Jan 2015 04:50
  • Modified 16 Jan 2015 04:50 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
If you have verified that you have voltage at all 3 inputs to the alternator connector and they are 2 at battery voltage and one at about 90%. Have verified you have a good ground to the housing?
  • Posted 16 Jan 2015 04:05
  • Reply by Bulldog965
  • Indiana, United States
Richard
I'm with Jeremy S on this. Check the wire to the starter. If it doesn't have one, run 1.
  • Posted 16 Jan 2015 02:25
  • Reply by RJN8
  • California, United States
I had issues with bad ground wires and bad batteries. Good luck
  • Posted 15 Jan 2015 00:27
  • Reply by Prentice
  • Ontario, Canada
what is the voltage at the output wire of the alternator? if it is good, which it should be since alternator checked good, run a wire to starter positive terminal or battery positive terminal. This is based on the assumption that regulator voltages at alternator terminals are correct.
  • Posted 14 Jan 2015 14:42
  • Reply by jeremy_s
  • California, United States

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