Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 04-04-2020, 08:36 PM   #1
1939 dave
Junior Member
 
Join Date: Oct 2019
Posts: 8
Default gas gauge 1939 tonner

what should be the voltage at the connection on sending unit with the wire disconnected?
1939 dave is offline   Reply With Quote
Old 04-04-2020, 09:03 PM   #2
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 14,873
Default Re: gas gauge 1939 tonner

On the connection itself? zero, it is a path to ground. The current flows from the gauge in the instrument panel to the sender to ground.
Attached Images
File Type: jpg Gauge Function.jpg (32.4 KB, 9 views)
JSeery is online now   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 04-04-2020, 09:26 PM   #3
1939 dave
Junior Member
 
Join Date: Oct 2019
Posts: 8
Default Re: gas gauge 1939 tonner

I installed new sending unit, gauge not showing anything truck has been sitting for 35 yr. don:t condition of gauge itself any ideas
1939 dave is offline   Reply With Quote
Old 04-04-2020, 09:39 PM   #4
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,614
Default Re: gas gauge 1939 tonner

Same old problem. Ford gauges use the "King-Seeley" system which works differently from most other systems. Most (probably all) replacement sending units are the resistance type and won't work well in Ford systems. Touching the wire to ground should make the gauge move. If it doesn't, either the gauge or the wire to it is bad. Try a jumper from the terminal on the gauge to ground. No action, the gauge is bad; if the gauge moves, the wire to the gauge is bad. Only touch the wire to ground for a short time or you will have other problems.
tubman is offline   Reply With Quote
Old 04-04-2020, 09:53 PM   #5
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 14,873
Default Re: gas gauge 1939 tonner

I assumed we were talking original here, see that is not the case! Still zero at the sender connection, but it will be a resistance unit.

Last edited by JSeery; 04-04-2020 at 09:58 PM.
JSeery is online now   Reply With Quote
Old 04-04-2020, 09:57 PM   #6
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 6,614
Default Re: gas gauge 1939 tonner

Quote:
Originally Posted by JSeery View Post
I made the assumed we were talking original here, see that is not the case! Still zero at the sender connection, but it will be a resistance unit.
He said the truck has been sitting 35 years. I don't see what is wrong with your original assumption.
tubman is offline   Reply With Quote
Old 04-05-2020, 09:24 AM   #7
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 8,136
Default Re: gas gauge 1939 tonner

Will this little pictorial help in checking your set up?
Attached Images
File Type: jpg IMG_2623b.jpg (22.4 KB, 12 views)
19Fordy is online now   Reply With Quote
Old 04-05-2020, 09:28 AM   #8
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 2,338
Default Re: gas gauge 1939 tonner

run a ground wire from one of the screws holding the gauge to the tank to a good clean location--grounded mine to the cab back wall with ign on, if you momentarily touch the gauge wire to this ground does the gauge on the dash work?
alanwoodieman is offline   Reply With Quote
Old 04-05-2020, 10:07 AM   #9
KGS
Senior Member
 
KGS's Avatar
 
Join Date: May 2010
Location: Schooley's Mountain
Posts: 520
Default Re: gas gauge 1939 tonner

Quote:
Originally Posted by 19Fordy View Post
Will this little pictorial help in checking your set up?
Should be positive ground for the 6 volt system on the Ford. Yes?
KGS is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 11:44 AM.