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Open Roads Forum  >  Tech Issues

 > Temperature sender/sensor... 7.3L

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groundhogy

PA

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Posted: 04/29/22 11:41am Link  |  Quote  |  Print  |  Notify Moderator

BurbMan... you are already fully buttered. And my mom always told me it's a sin to waste butter.
But you beat me to it. That's the first thing I thought of when I saw the Radio Shack reference.

I watched it more carefully this morning.
At first key turn, with engine cold... the gauge was at 1/4 hot.
Then in about 5-7 minutes, it drifts up to full hot.

Then the red light comes on telling you to look at your gauges, something is wrong.

Then at some point un-noticed, the needle is back to full cold.

If this happens every day the same way, then how can this be a chaffed wiring issue?

Also, the temperature circuit worked fine when the old sender was good (granted it's been broke for about 6 months though).

Gjac

Milford, CT

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Posted: 04/29/22 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

Do you have one wire or two wires going to the sensor? If one, the ground is through the treads to the block and could be bad. I would remove and check threads clean and reinsert. If two, one is a ground wire, check it to a known ground. The other wire should have voltage to it, voltage will vary as sensor get hotter. Turn key on to see if voltage is there. If you have voltage on one and ground on the other your sensor or gage is bad if you are missing ground or voltage one of your wires is bad.

Lantley

Ellicott City, Maryland

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Posted: 04/29/22 02:04pm Link  |  Quote  |  Print  |  Notify Moderator

I had 2 issues with my 2019 truck involving the connector ...not the sensor or the wire.
The sensor is covered under warranty , wire and connector are not! Go figure!


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groundhogy

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Posted: 04/29/22 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

I will put a multi meter on both sensor and wires tomorrow probably.
Also someone mentioned looking up the proper sensor ohms range.

It is a 2 wire affair.

groundhogy

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Posted: 04/30/22 11:15am Link  |  Quote  |  Print  |  Notify Moderator

This is what I measured from the sensor and the connector terminals

-4.4 kohm at 60F
-5vdc on connector
-gauge 1/3 at 60F

groundhogy

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Posted: 04/30/22 11:18am Link  |  Quote  |  Print  |  Notify Moderator

So in 2003, it was the last year gor the 7.3L. They changed over to the 6.0L that year.

I just went on Rock auto and looked at the 6.0 trmp sender... looks mechanically the same to my eyes..

groundhogy

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Posted: 04/30/22 11:26am Link  |  Quote  |  Print  |  Notify Moderator

SW5130 is the motorcraft part number listed for both 7.3 and 6.0

Gjac

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Posted: 04/30/22 06:22pm Link  |  Quote  |  Print  |  Notify Moderator

What did your ground wire read between the wire terminal and the engine block?

groundhogy

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Posted: 05/01/22 03:43pm Link  |  Quote  |  Print  |  Notify Moderator

I didn’t try measuring that since it is a 2 wire situation.
Ground matters in this situation?

groundhogy

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Posted: 05/01/22 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Measured 5vdc at the two wires

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