FYI FORD - MustangSteve's Ford Mustang Forum
The Internet's Most Knowledgeable Classic Mustang Information
IF YOU HAVE A QUESTION ABOUT CLASSIC FORD MUSTANGS, YOU HAVE COME TO THE RIGHT PLACE!
MustangSteve has over 30 years of Mustang experience, having owned 30 of them and restored several others. With the help of other Mustangers, this site is dedicated to helping anyone wanting to restore or modify their Mustang.... THERE ARE NO DUMB QUESTIONS!!!!!
Visit MustangSteve's web site to view some of my work and find details for:
FYIFORD Contributors' PICTURES - Power Brake Retrofit Kits for 65-66 Stangs - Classic Mustang FAQ's by MustangSteve - How to wire in a Duraspark Ignition - Mustang Ride Height Pictures and Descriptions - Steel Bushings to fit Granada Spindles to Mustang Tie Rods - Visit my EBAY store MustangSteve Performance - How to Install Granada Disc Brakes MustangSteve's Disc Brake Swap Page - FYIFORD Acronyms for guide to all the acronyms used on this page - FYIFORD Important information and upcoming events

You are not logged in. Would you like to login or register?

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » SunPro Elect. Temp. Gauge Help

    • 1 of 1

       

    8/07/2014 11:56 AM  #1

    rap
    FYI FORD Member

    Offline

    Registered: 5/15/2013
    Posts: 25

    SunPro Elect. Temp. Gauge Help

    64 1/2, 289 HiPo, Power Steering, Air, Auto. Installed new (hang below dash) air conditioning unit. Orig. sweep temp. gauge was not working and though one with degrees would be better. Bought a SunPro electrical. Hooked it up with a new sender unit. Took power from + coil which read 12 volts. After temp. reached 180 I turned on the air, the temp. gauge showed the temp. dropped and increasing the rpm increased the temp. which I thought would be the exact opposite in both cases. Checked the volts at the coil with the engine running and got 12 volts until I put on the air at which time it dropped to 10 volts. Any thought as to why the wacky readings or what I have done wrong? Thanks, Randy

     

    8/07/2014 1:47 PM  #2

    Pablo
    FYI Addict

    Offline

    From: Georgetown, Texas
    Registered: 4/12/2013
    Posts: 248

    Re: SunPro Elect. Temp. Gauge Help

    Rap, try running a jumper wire from the positive battery terminal to the wire that goes to the temp. gage.  Disconnect it from the coil + post first.  Now see if it reacts correctly.
    Also, do you still have the factory generator on your car?  That could account for low readings at low RPM.
    Good Luck

     

    8/07/2014 3:18 PM  #3

    Michael H.
    I FYI 24-7

    Offline

    From: Laurel, MS
    Registered: 4/01/2013
    Posts: 869

    Re: SunPro Elect. Temp. Gauge Help

    The positive coil wire normall does not have a full 12v while running because of the stock resistance wire (unless, of course, the resistance wire has been removed).  There is an extra plug on the back of the ignition switch that is meant to be used for 12v switched accessory power.  I would hook it up to that.

     

     

    1 of 1

  • Index
  •  » FYI Ford, Classic Mustang Tech Discussion
  •  »  SunPro Elect. Temp. Gauge Help

    • Board footera


    REMEMBER!!! When posting a question about your Mustang or other Ford on this forum, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.