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Old 04-01-2013, 02:06 PM   #1
johndob1929
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Default 50 flathead V8 temp. sending units

can anyone tell me if the stock sending units (one in each head) on my 50 flathead V8 (one has 2 wires on it and one has one wire but the wires were cut right at the sending units) are for a dummy light or will they run a old electric temp. gage ? i want to run the old electric temp. gage. do i need special sending units (if so, what am am i looking for ?). how do i wire them ? i am still using the original 6 volt, positive ground system. thanks - john
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Old 04-01-2013, 05:25 PM   #2
Cecil/WV
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Default Re: 50 flathead V8 temp. sending units

Run a wire from the sender with the single terminal to one of the terminals on the dual post sender and then a wire from the other terminal to the gauge. if everything is good, it will work.
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Old 04-01-2013, 08:03 PM   #3
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Default Re: 50 flathead V8 temp. sending units

The single-pole sender provides variable resistance as the temperature rises and falls, thus sends the reading to your gauge. The two-pole sender is an on/off unit which when closed, is a pass-through device, sending the resistance feed from the single-pole sender on to the gauge. When it senses an overheat condition, it goes open, breaks the circuit, and the gauge will indicate full-on hot. Kinda Mickey Mouse, but it works pretty well on a motor with two separate cooling systems. An alternative is to install two of the single pole sensors and a L/R switch so each head can be individually monitored. Or use a dual readout gauge and senders from someone like Westach.
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Old 04-01-2013, 08:27 PM   #4
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Default Re: 50 flathead V8 temp. sending units

I agree with TStiles. The water temp indicating system is a bit strange. It works if all the components are right. You can wire two single pole units through a double pole switch to see the temp on each side of the engine. Be aware the after market single pole sensors work per the description in the '53 owners manual. That states something top like "normal indication is below hot". In my '53 six and '41 V8 the indicator sits over the last graduation before the H. So if it is in an over heat condition the pointer move less than an 1/8". So much for high visuals.
The attached shows the original set up.
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File Type: jpg Water temp.jpg (38.6 KB, 127 views)

Last edited by 41ford1; 04-01-2013 at 09:33 PM.
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Old 04-01-2013, 09:22 PM   #5
Flathead man2
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Default Re: 50 flathead V8 temp. sending units

I didnt know these engines use electrical temp sensor I thought it was the bulb type that has a thick heat conducting wire that runs to the needle on the guage. I dont know if that worked but it's a picture of a mechanical temp guage.

[IMG]www.robrobinette.com/water_temp_gauge.htm[/IMG]
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Old 04-01-2013, 10:15 PM   #6
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Default Re: 50 flathead V8 temp. sending units

here's the wiring diagram from MacVP's website....those senders should work with your gauge.....still 6V??....Mike

http://www.vanpeltsales.com/FH_web/F...1949-50car.jpg
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Old 04-01-2013, 10:30 PM   #7
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Default Re: 50 flathead V8 temp. sending units

Quote:
Originally Posted by Flathead man2 View Post
I didnt know these engines use electrical temp sensor I thought it was the bulb type that has a thick heat conducting wire that runs to the needle on the guage. I dont know if that worked but it's a picture of a mechanical temp guage.

[IMG]www.robrobinette.com/water_temp_gauge.htm[/IMG]
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Old 04-02-2013, 01:54 PM   #8
Flathead man2
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Default Re: 50 flathead V8 temp. sending units

Sorry.
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Old 04-04-2013, 12:51 PM   #9
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Default Re: 50 flathead V8 temp. sending units

The link works if you take the "img" off each end. Or at least it did for me.
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Old 04-04-2013, 12:56 PM   #10
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Default Re: 50 flathead V8 temp. sending units

www.robrobinette.com/water_temp_gauge.htm
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Old 11-07-2019, 06:03 PM   #11
Hemiman392
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Default Re: 50 flathead V8 temp. sending units

Do the two thermostats wire the same if 12 v like my ne. Thanks for the advice.
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Old 11-07-2019, 07:46 PM   #12
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Default Re: 50 flathead V8 temp. sending units

There is some bad information in this thread! The KS gauge system does not work on resistance like a modern sender would. They are a current pulse system. The power is input to one terminal of the dash gauge, the other terminal is connected to the sender on the head that has two terminals. The other terminal on the sender goes over to the single terminal sender on the other head. The current flows from the power source through the dash gauge which has a coil that heats up a bi-metal strip that moves the gauge needle. Then through the two terminal sender which in normally closed below a set temperature (it is an on/off switch) on to the single terminal sender. The single terminal sender has a set of points that pulses in relationship to the engine temperature. The rate of this pulse determines the current flow in the circuit and thus the amount of heat in the gauge coil. It works the same on 6v or 12v and will work with ether polarity (+ or - ground). But it does need a voltage drop at the input to the dash gauge. When Ford switched to 12v systems they kept the same type of gauges and senders and added a voltage drop unit. One option is to use the voltage drop off of a later 12v Ford or some prefer other drops that are available. A diagram was posted in #4.

Last edited by JSeery; 11-07-2019 at 07:59 PM.
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