not charging

[cturbo]

My trucks new batterys keep going dead so i checked the charging system and its only showing 23.8 volts at the batterys.My dads truck shows 27.9 volts at idle.Is this likey the voltage regulator? if so could someone tell me where to find this thing, cuz its not on the firewall.

 

[Bad_Carp]

If you have the 60A alternator, the voltage reg is integral. i.e. part of the alt, right on top of it.

 

[gimpyrobb]

Near where the wires attach, there is a hex plug. You need to remove that and grab a slotted screw driver. Under the hex plug is a pot. that will adjust the voltage output up/down. Use the slotted screw driver to adjust it.

 

[Bill W]

Here
Regulator is internal and mounted on back cover (pic #2)

 

[cranetruck]

At 23.8 you are reading the battery voltage and I'd say the you are beyond the range of adjustment. Most likely a bad regulator assy.

 

[cturbo]

Thanks guys but that wasnt it.so i replaced the gen with a used one and I got he same exact reading.What could this be??

 

[gimpyrobb]

Start with the basics. Do you have a ground going from the frame to the alt?

 

[G-Force]

How do you know the one you put on was good?
Take it and get it tested.

 

[doghead]

Did you follow the test/troubleshooting proceedure in the TM...

 

[cturbo]

I just checked the ground wire it checked at 0ohms.I tested the generator with the truck running and it measured 23.8 volts.so I am guessing this is a bad one too.

 

[doghead]

Which ground wire?


The small wire on the alt needs to have switched power. Does it?

There is a step by step trouble shooting procedure. It is alot more efficient for you to follow that, than for 30000 members to offer ideas randomly.

If the troubleshooting procedure fails to find your problem, that is when I would ask for ideas.

 

[cturbo]

The wire from the alt. to the frame is 0ohms.

What do you mean by switched power?

 

[stancanpara]

Which ground wire?


The small wire on the alt needs to have switched power. Does it?

There is a step by step trouble shooting procedure. It is alot more efficient for you to follow that, than for 30000 members to offer ideas randomly.

If the troubleshooting procedure fails to find your problem, that is when I would ask for ideas.

I agree.... if the credit card is good, you should be able to charge....

Seriously, the step by step procedures are your best bet! To me, it sounds like the alternator just needs to be adjusted up a little. Don't turn the screw TOO much, it's pretty sensitive.

 

[cturbo]

I already tried that it didint change

 

[doghead]

Your alternator has 2 wires going under the terminal cover. One is "large" and one is "small". The small wire has to have voltage when the ignition switch(on the dash) is turned on, it excites the alternator.

If you follow the test proceedure in the tm, it tells you this.

 

[tm america]

If you get tired of wasting time and money on 40 yr old (good)take offs.. i could set you up with brand new alt with a warrenty probably for the same or less than you paid for the ones you been getting .. check the classified for my kit.Also dont forget you might have a bad battery. Check the voltage on each one separately.. If they arent the same that might be the problem why you are killing alts

 

[cturbo]

Well i checked that little wire no voltage.I traced it back to the switch and here the wires were plugged in wrong.Put them in according to the TM and now nothing works.So I am assuming the switch is bad.

 

[doghead]

I would pull the switch and test it with an ohm meter. replace if nessasary.

 

[cbvet]

And please remember 28 volts can do a lot of damage if you short a hot lead to something. Disconnect the battery first!

 

[kkbodyshop]

just buy a 24volt alternator . i did it on mine