MLU FORUM  

Go Back   MLU FORUM > MILITARY VEHICLES > The Restoration Forum

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 24-07-12, 12:43
John Mackie John Mackie is offline
Registered User
 
Join Date: Apr 2009
Location: Australia
Posts: 121
Default Ford dash gauges

The dash gauges used on 1940/50 Fords consist of a bi-metal strip wound with insulated resistance wire. When the gauge is working the current passing through the winding heats the bi-metal strip which bends and causes the pointer to move across the scale. The deflection is proportional to the current passing through the winding. The sender (fuel tank unit or oil pressure sender) also has a bi-metal strip and a winding BUT one end of this winding goes to ground via a set of points, the other goes to the terminal which goes to the dash unit. As the temperature or oil pressure alters the fixed end of the bi-metal strip is moved by a diapfragm meaning that more heat is required to open the points. This requires more current through both bi-metal strips and also an altered reading on the gauge. The temperature gauge usually reads “backwards” with no current or the ignition turned off the needle points to hot. The later fords also had a temperature switch in the second head which opened if that head got too hot causing the gauge to read hot.

Enter the 1960’s. Cars had gone to 12 volt. The falcon still used c6 volt gauges fed with 6 volts from a bi-metal voltage regulator incorporated into the temperature gauge . this regulator supplied short pulses of 12 volts . which averaged out at 6 v. later cars used an “instrument cluster constant voltage regulator” Ford base # 10804. Mac’s list 4 types . all do the same basic job. All these work on the make and break principle and are responsible for the tick tick that can often be heard in the car radio. Solid state devices are now available that do the same job and cost a lot less
__________________
John Mackie (Snr) VK2ZDM

Ford GPW- script
#3A Ford Trailer
M3A1 White Scout Car
-Under restoration-
1941 Ford Truck (Tex Morton)
F15A Blitz
Radio sets- #19, #122, #62, ART13, and Command
Reply With Quote
  #2  
Old 24-07-12, 14:12
Mike Kelly's Avatar
Mike Kelly Mike Kelly is offline
Fan of Lord Nuffield
 
Join Date: Feb 2003
Location: Victoria Australia
Posts: 5,579
Default Thanks

Hi John

Great information and clearly explained, even I can understand it

Mike
__________________
1940 cab 11 C8
1940 Morris-Commercial PU
1941 Morris-Commercial CS8
1940 Chev. 15cwt GS Van ( Aust.)
1942-45 Jeep salad
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


All times are GMT +2. The time now is 22:30.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright © Maple Leaf Up, 2003-2016