If i put a certain amount of electric draw, my truck either bogs out, or just dies. It got progessivly worse and thought it was the altinator. Got a new one, doing the same thing. Ive checked all grounds, all wiring seems to be in tact. Any help? I have a video of what its doing. It seems like its not charging the altinator

 

Break out the Meter get some real world numbers

Without voltage readings at different places you have no idea what is going on.

Engine ?? Mileage ??

How old is the battery ??

How does the wire coming off the B Terminal of the Alternator look lioke??

Poor connection at the alternator plug or it is corroded .

Bad Alternator from the place you bought it .

Did you have the old one tested??

 

22re Just hit 200k, normal 12V off and 14on. Once i put draw then goes down and decends. Tried with a friends new battery and still did same thing. Nothings corroded and no i didnt get it checked. Napa's load tester was broken they claimed.

 

[YOUTUBE]http://youtu.be/HT-c7Q4Y[/YOUTUBE]
Once i past that certain amount of draw, it chops out or dies. sometimes it gets to the point where i can't even have just my turn signal and radio on

 

Have you done ALL the necessary voltage test points?
Gotta do them ALL ...
HERE

 

Now if your charging at 14 Volts it sure is not a charging problem .

Sounds like something else .

Once the system voltage drops past like 11.5 The Ecu goes into protection mode and powers down .

Just how did you check things remove them and clean or just glance and call it good.

This is to much like work !!! This is supposed to be relaxing and calming

 

Yes, all connections should have shiny bare metal touching shiny bare metal.
Yes, work should be calming. If not, quit - LOL!

 

I took off all the grounds and checked. I took of some other wires thinking there would be corrosion and werent corroded. Same with terminals. Ill check the volts to the altinator pins when i head home

 

Should i take my new altinator off and put it through a load test first??

 

Just where did you measure your 14 VDC ??

That was with the lights on blower Motor on High Flashers on??

 

Yeah. My lights, heater blower, and my 46"LED. It will do it if lets say: 20"LED, parking light, stereo playing is on

 

Where did you measure your 14VDC ??

What does the voltage measure when it starts to run poor??

 

Okay so tested altinator, passed twice failed once. Swapped for a new one, and put it in.


Ignition is reading 12v,
white S read 12,
And I believe the other white one "B" was also 14.7 if I remember??

 

I was measuring at the battery. 11v on with no draw, goes down to like 9.3 and chops out past. I measured the altinator I had before I got the new one tonight and It was only charging to 30amps. New altinator does the same but I didn't measure the amps it was putting out

 

REPEAT:
Have you done ALL the necessary voltage test points?
Gotta do them ALL ...
HERE

 

Recap:
think white wire "B" read 14.7 cold. Can't remember what it was hot so I'll test it again tomorrow
"S" read 12
"IG" read 12 constant

 

Sounds like you have bad battery. What do you read at battery post when all is off?

 

Put a load tester and tried 2 different batteries, same story. Read 12

 

A charged battery (without load) should read about 12.6volts. A big load could pull it down to 12.00v, but if it's just sitting there at 12.00v it's almost completely discharged (the last few tenths are temperature dependent, so don't over analyze this).

When the engine is running it should read about 14.1v AT THE BATTERY (and everywhere else on the "12v" bus)

If you're getting 14.7v at the alternator (altinator?) but 12v at the battery (or S or IG), the alternator may be working but you may have a broken B output wire (the big one from the stud) between the alternator and the battery. With 12.00v on the S (sense) wire, the alternator's regulator keeps boosting the output voltage trying to bring S up to 14.1. That could explain your rather high 14.7v on the B wire. http://www.cygnusx1.net/Media/Supra/...otaTech/h8.pdf

And if the B wire is not connected to the battery, you will have no charging.

 

+1

Trace that thick wire, and inspect this: