Temperature gauge problem

farmersjeepster

Bigger Hammer
Mar 5, 2019
30
23116
First Name
Garry
Willys Model
Jeepster
Willys Year:
1950
I have a 1950 jeepster with orginial gauges. Since this was a off frame restoration all the gauges were clean and checked. Since someone had added axilary gauges with capillary tubes I also installed a new temp sending unit so I could use the original temp gauge. The Unit was bought from a reputable vendor. All the
gauges are working correctly except the temp. The gauge registers hot after a few minutes of running but I have checked the engine temperature and it is running at a proper temperature. I tested the temp gauge with a 4.7 volt power source and a variable resistor. Here are the results:
Zero resistance the gauge read hot or 100%
10 ohm resistor ... gauge 75% towards hot(to right)
20 ohm resistor... gauge read 48% towards hot
30 ohm resistor... gauge reads 25% towards hot
Does anyone know if the gauge is correct?
Suggestions PLEASE!!!!!
 

peashooter

Gear Grinder
Apr 14, 2013
22
ca
First Name
kevin
Willys Model
Other
Willys Year:
1948
I have a 12 volt system with Runtz resistors from 5th Ave. on the original gauges. The temp gauge needed a 100 ohm resistor parallel to the sending unit. Appears to read accurately.
 

farmersjeepster

Bigger Hammer
Mar 5, 2019
30
23116
First Name
Garry
Willys Model
Jeepster
Willys Year:
1950
Thanks but does anyone know what the correct ohms are for the original temperature gauge
 

farmersjeepster

Bigger Hammer
Mar 5, 2019
30
23116
First Name
Garry
Willys Model
Jeepster
Willys Year:
1950
No it's running in the proper direction. Is just registers hot but the engine is not. I've order a ivr hope that's the problem
 

Stakebed

Well Oiled
All-Star
Mar 4, 2020
1,871
Northern California
First Name
Joseph
Willys Model
Pickup
Willys Year:
1957
No it's running in the proper direction. Is just registers hot but the engine is not. I've order a ivr hope that's the problem
I do not know about Jeepsters but for wagons and truck from '47-'50.5, Willys did not use an IVR. Gauges from King Seely operated on straight battery voltage. As such, if your Jeepster was/is the same the gauges will want a minimum of 6.3v as opposed to the '50.5 and later gauges that DID come with IVR's and use 5.5v.
 

farmersjeepster

Bigger Hammer
Mar 5, 2019
30
23116
First Name
Garry
Willys Model
Jeepster
Willys Year:
1950
Thanks. I know that the gauges that are in it now have a ivr, but I have checked it and it is not working. I yes there is always the chance that the gauges were replaced somewhere down the line but they sure look original.
 

2cubs2cases

Bigger Hammer
All-Star
Mar 15, 2016
141
ny
First Name
mike
Willys Model
Wagon
Willys Year:
1963
Thanks. I know that the gauges that are in it now have a ivr, but I have checked it and it is not working. I yes there is always the chance that the gauges were replaced somewhere down the line but they sure look original.
Found this maybe it helps. 1593621751895.png1593621771681.png
 

farmersjeepster

Bigger Hammer
Mar 5, 2019
30
23116
First Name
Garry
Willys Model
Jeepster
Willys Year:
1950
Thanks that a big help! Do you have any idea what the voltage should be coming out of the ivr?
 

Stakebed

Well Oiled
All-Star
Mar 4, 2020
1,871
Northern California
First Name
Joseph
Willys Model
Pickup
Willys Year:
1957
Start a thread, post pics of your exterior and gauges. I'm sure the Jeepster experts can help.
 

Bill Kuran

Well Oiled
All-Star
Oct 14, 2009
1,063
Potomac, MD
First Name
Bill
Willys Model
Wagon
Willys Year:
1960
Is there anyway to determine if my jeepster is a 50.5 and later?
Try to get the speedometer dial and gauge part numbers. You may be able to see them, without taking the cluster apart, by looking at an angle, through the glass. Knowing the part numbers will tell you (or someone) when (years and vehicles) they were used and how (operating voltage and sender resistance) they are supposed to work. You mentioned not knowing for sure if the gauges are original to the vehicle.
 

farmersjeepster

Bigger Hammer
Mar 5, 2019
30
23116
First Name
Garry
Willys Model
Jeepster
Willys Year:
1950
I'll see what I can find. As far as I know the gauges are orginial. They do not look like they have been replaced but who know what happened over 70 years. If I can find a part number who should I contact?
 

mikel

Bigger Hammer
Oct 14, 2019
26
Georgia
First Name
Mike
Willys Model
Other
Willys Year:
1950
Here is a picture of one of the gauge cluster with the stock instrument voltage regulator mounted on it. If you have this part then I assume you have the later 50 model. When I converted to 12 volts, I just used a cheap 12-5 voltage regulator. The gauges seem to work good at the 5 volt level.

Mike
 

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