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Old 11-14-2010, 05:02 PM   #1 (permalink)
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voltage fluctuation

I've been having problems with the charging system cycling on/off. Tried to track down a shorted wire/connection but no luck so I decided to bypass the PCM & install an external voltage regulator. After reading the posts on here regarding the installation I mounted the new external regulator on firewall, connected field wires from alternator to the regulator according to previous threads. I also connected switched power to the wire at the "top of the pyramid" on the regulator. The system is now charging but is fluctuating from 14-14.5 volts causing a pulsing of the interior lights and headlights. Voltage at the regulator on the two wires coming from the alternator are 14-14.5 volts on the wire with switched power and +/-8-14 volts on the other wire. Is that much of a change in voltage on the other field wire common? Any ideas on how the keep the voltage from cycling & causing lights to pulse? Any help is appreciated.
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Old 11-14-2010, 08:36 PM   #2 (permalink)
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Do they pulse all the time? Or just after start-up?
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Old 11-14-2010, 08:49 PM   #3 (permalink)
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it only happens when running-both at idle and when I increase rpm
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Old 11-14-2010, 09:02 PM   #4 (permalink)
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yea but just after start up or does it do it after driving for say 20 minutes and you are stopped at a red light...
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Old 11-14-2010, 09:08 PM   #5 (permalink)
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all the time-from start up when the grid heater's cycling to when it's warmed up & running as normal--everything seems to be ok other than the .5-1.0 volt fluctuation/pulsing that's going on
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Old 11-14-2010, 09:38 PM   #6 (permalink)
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hmm...thats weird, pulses are normal while the grid heaters are cycling as they draw a lot. Do you know if they shut off...could be something with them constantly cycling and not stopping like they should once engine temps are up.
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Old 11-14-2010, 10:52 PM   #7 (permalink)
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The grid heaters are working as normal--the fluctuation in voltage is very quick (1/2 second or so) and only about 1/2 a volt or so but it does cause a slight flickering in the lights.
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Old 11-14-2010, 10:56 PM   #8 (permalink)
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thats weird....
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Old 11-14-2010, 11:32 PM   #9 (permalink)
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I guess my question is...what is the normal voltage output for the two smaller field wires on the alternator? and is that voltage supposed to fluctuate? I made connections according to this diagram from DTR and as show I am reading 14 to 14.5 volts on the red line in diagram and 8 to 14.5 volts on the blue wire in the diagram. Is this typical or what should it be?
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Old 11-15-2010, 08:28 AM   #10 (permalink)
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it might be the alternator, the alternating creates alternating current and then an internal regulator converts that to DC....I would find a shop that would test your alternator for free or a few bucks....
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Old 11-15-2010, 02:18 PM   #11 (permalink)
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alternator checks out ok--any other ideas?
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Old 11-15-2010, 09:12 PM   #12 (permalink)
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Did you use an older style mechanical regulator or a solid state one?
The older relay type often cycle up and down a little.
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