TOO MUCH VOLTAGE??

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Oct 3, 2013 | 04:13 PM

#16

gfw1985

Cranky Old Guy

Joined: Mar 2008

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From: Raphine, Virginia

Simple to tell if it's a 3G. It will not have the external fan blade behind the pulley.

Oct 3, 2013 | 08:57 PM

#17

FECruzer69

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Joined: Jul 2010

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Quote:

Originally Posted by JEFFFAFA

If your alternator has separate terminals arranged like the ones in this drawing it most likely is not internally regulated. Yes, 16.9 volts is way too much, a charging voltage of between 13.0 -14.7 is normal.

Oct 3, 2013 | 10:25 PM

#18

bullmoose11

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Joined: Jun 2013

Posts: 66

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From: NorCal

Just a wild half baked idea, but, you could hook your meter where you can see it and pull one fuse at a time from the fuse block. looking for the voltage to drop to 14.5 or below. You could have a parasitic draw when the key is on. Some radios pull juice when the key is off.

The other thing you could do too is either feel the under dash for hot wires being a high resistance connection, or use a non contact infra red thermometer to check for hot connections. They are like $25 at our beloved Horrible Freight.

PS Might check battery cables starter solenoid with the non contact thermometer as well. ya never know.

I use non contact infrared thermometer to check connections on my golf cart and electric car for high resistance connections ie., corrosion dirt oxidation, poor crimp.

Oct 3, 2013 | 11:40 PM

#19

70-360fe

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Quote:

Originally Posted by gfw1985

Simple to tell if it's a 3G. It will not have the external fan blade behind the pulley.

Yes check the fan. If you do have a 3g I'am guess it has a blown reg. You can buy a new one or get one cheap at the junk yard.

http://www.bcbroncos.com/3G%203%20wi...ter%20mark.pdf

Oct 3, 2013 | 11:56 PM

#20

70-360fe

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Quote:

Originally Posted by 70-360fe

Yes check the fan. If you do have a 3g I'am guess it has a blown reg. You can buy a new one or get one cheap at the junk yard.

http://www.bcbroncos.com/3G%203%20wi...ter%20mark.pdf

3G Interchange Facts. If you're thinking 3G read here. - FSB Forums

https://www.google.com/search?q=3g+a...&bih=398&dpr=1

If don't have 3g (plug looks like might be 3g) might be a good time to upgrade, cheap if you get alt. from junk yard. Sorry about double post.

Oct 4, 2013 | 06:44 AM

#21

gfw1985

Cranky Old Guy

Joined: Mar 2008

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From: Raphine, Virginia

Before you "too" carried away, have the battery fully charged and tested. I have seen alternators charge at 17v simply due to the battery being weak. You have some good advise already posted to solve your problem.

Oct 7, 2013 | 01:46 PM

#22

sgt.bigjim

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Joined: Apr 2013

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From: Central Coast, Calif.

Sorry, went out of town this weekend. I now know it's not a 3g alternator. I still believe it just might be the wiring is not hook up correctly. I did check the battery which shows 12.45 and I had Autozone also check it out. The battery appears to be good. No hot wires up the dash, I'll get back on it tonight and see what I can come up with.

Thanks for all replies, I'll let you know when I figure it out.

Jim

Oct 10, 2013 | 09:49 PM

#23

sgt.bigjim

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Joined: Apr 2013

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From: Central Coast, Calif.

I finally got it!

Thanks for all the help, there was a better diagram on another thread that was a little bit clearer for me. The bottom line was the wire going to the "a" post on the regulator was not hook up to the Batt. post of the alternator. Once everything was hook up I'm pulling 14.5 v when idling.

Thanks again, could have don't without ALL the help.

Jim