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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-07-2010
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Voltage issue

I'm losing volts somewhere; it seems to get worse under a load. But it still seems low even at idle. I disconnected (from the battery) all the extras to rule out a short in those lines.

The alternator and battery (tested both) are both good. I was thinking the belt was slipping, but it seems fine. I noticed the tensioner pulley was moving at idle back and forth. So the question is under a load could it get worse and slip, then in turn my alternator isn't spinning properly, thus not charging the system? Or does that pulley move anyway and itís no big deal?
I donít hear any bearing not allowing something to spin, but the ac does seem a bit loud.
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Old 07-08-2010
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How many volts is your alt putting out when idling? Mine puts out around 14.-14.2v
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Old 07-08-2010
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14 even
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Old 07-08-2010
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13.5 to 15 volts would be normal...what is the issue you are having to make you believe you're loosing current? Rev the engine to 2000 or more RPM's and see what it's putting out for Volts...The amperage is what you would really want to check, but you would need an amp clamp for that.
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Old 07-08-2010
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Quote:
Originally Posted by FX403/STX96 View Post
14 even
That's not low...
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Old 07-08-2010
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That's not low...

+1
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Old 07-08-2010
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No amp meter, but the gauage is drops at higher rpms with a load, and it's where it normaly was a few days ago.I know its not a short it no fuses are blowing.
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Old 07-08-2010
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Did you check it at 2000+ RPM's? And what are the readings.
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Old 07-09-2010
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Originally Posted by FX403/STX96 View Post
No amp meter, but the gauage is drops at higher rpms with a load, and it's where it normaly was a few days ago.I know its not a short it no fuses are blowing.
If the voltage is dropping at higher RPMs, you need brushes in your alternator. When they wear, and become shorter, the spring tension drops, and contact can't be maintained at the higher RPMs.
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Old 07-09-2010
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Pull it get it tested.
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Old 07-09-2010
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All ready did that. 95% sure the guage is or has gone bad.
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Old 07-09-2010
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I wouldn't be worried, just pick up an aftermarket volt gauge or get a scangauge II
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Old 07-10-2010
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On the alt there is a tiny little wire on a single connector that is not weatherproofed. It can cause the wire to fail at it or up from it. Bend this wire, if it feels brittle replace it.

Dont trust the dash gauge try and wire up something else.
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