Jump to content
Sign in to follow this  
wagntagn

2001 cummins transfer pump voltage

Recommended Posts

Does anybody know the voltage when starting .When I turn the switch to on I m picking up 12 volts for 2 seconds & then it drops to 8 volts? Then when I turn the switch to start & let go I get 12 volts for 25 seconds then voltage drops to 8 volts? Why does it drop to 8 you would think it should drop to 0 volts.These test are done at the transfer pump connector.

Share this post


Link to post
Share on other sites

does anybody know where to go to check voltage specs when turning ignition on & then start position,my voltage never drops to 0 it goes down to 8 volts only?:cookoo:

Not sure of your question.:shrug:

Share this post


Link to post
Share on other sites

what happen is I wanted to check the pressure between transfer pump & vp44 ,my gauge was reading 0 psi so I unplug connecter on transfer pump & check voltage with my meter and the results were with key on 12 volts for 2 seconds then voltage went down to 8 volts ?then I turned the switch to start & let go I was getting 12 volts for 25 seconds & then the voltage dropped to 8 volts until I turn switch to off ,voltage dropped to 0 ,why is it staying at 8 volts you would think it should drop to 0 volts.Afterwards I pull the pump out and it s seized so ordered a FASS pump as replacement,Ijust want to make sure of the good voltage before I do the switcharoo.:(

Share this post


Link to post
Share on other sites

Up in the" BOONIES" northern Ontario,just bought the cummins with a defective transfer case,I did those repairs & now I want to make sure I have enough fuel press. before I start on the modifications.0 psi is not enough ,I ll replace the transfer pump,I m worried about the 8 volts I have when I flick the switch,this can be hard on a 12 volt pump

Share this post


Link to post
Share on other sites

Either its 0 Volts turned off or 12 Volts turned on... Full controlled by the ECM...

Posted Image

OFF should 0 Volts

Cranking should be modulated 12 Volts (Square wave)

Running should 12 Volts solid.

No there is no relay or other controllers. Either the ECM has a bad ground, poor power supply, or ECM is starting to fail.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  



×