Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - wrong guage reading
View Single Post
  #14 (permalink)  
Old 04-06-2007, 07:06 PM
docvette's Avatar
docvette docvette is offline
Registered User
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 65
Posts: 7,360
Wiki Edits: 12

Thanks: 0
Thanked 7 Times in 4 Posts
Originally Posted by goshawks00
Doc why does the gauge go up to full when grounded then if the gauge is damaged?
Doc here,

See, that is NOT what you said..

Originally Posted by goshawks00
Update--- I reattached gauge to six volts..... the gauge goes up to "E" with the key on. With key turned off the gauge goes way below( like as far as it physically can) "E".

Disconnected ( actually cut wire mid way between gauge and sending unit) as figured I'd need to add in a potentiator. The guage does not not move at all with key on, still bottomed out.
Disconnect the sender Wire at the back of the gauge..turn key gauge..goes to full..its working...the sender wire is bad..If it does not go to full .. the gauge is toast..(or needs the sender to ground instead of opening the sender wire to climb to full) IF it does go to full (in either mode) the wire OR sender is bad...

Your posts indicated the scale was now between E and sub E, which was the way I read it, If you get a full scale sweep on the gauge by grounding/ungrounding the sender wire AT 6 volts AT the gauge (not downstream) it is working..leave it alone..just put in the calibrating I posted, and calibrate it as I said..

Reply With Quote