[Notes]

Summit analog electrical oil pressure gauge. It had worked fine before. Now it stays pegged at 100. Is there a way to test whether or not it's the gauge or the sender - or maybe both? Don't want to crawl under the car with my new knee if I don't have to. Thanks

 

[BillK]

Is it only pegged with the ignition on ? Or all the time ? Sounds like the wire going to the sender might be shorted to ground somewhere ? Only way to isolate the sender for sure would be to take the wire off it.

 

[Peewee0413]

Is it only pegged with the ignition on ? Or all the time ? Sounds like the wire going to the sender might be shorted to ground somewhere ? Only way to isolate the sender for sure would be to take the wire off it.

I thought they peg when the circuit is open?

Sent from my SM-G998U using Tapatalk

 

[Notes]

Meter reads zero with key off. Around 60 with key on, & 100 with engine running.

 

[BillK]

Meter reads zero with key off. Around 60 with key on, & 100 with engine running.

That almost sounds like the sender. If the wire was shorted to ground it would be pegged all of the time.

From the Autometer website. I think most gauges are the same.

My SSE oil pressure and water temperature gauge are reading too high, and getting there too quickly.
Sometimes with this symptom, it will read pressure merely by turning the power on, or read temperature before the engine has even been started. This would be most often, the loose or missing nut on the ground terminal, on the rear of the gauge. The next most common is using poor or insufficient ground for the gauge. After that, check for an incorrect, or faulty sender.

SSE pressure and temperature have no reading.
Assuming the gauge power and ground are proven good, attach a jumper wire from the end of the sender wire (at the sender), and the other end to ground. The gauge should deflect to full-scale reading. If it does, then check to make sure the sender is threaded into something grounded. For example, threading into an adapter, teed into a rubber hose requires the adapter to be grounded.

 

[Notes]

Thanks. Just read that you should not use teflon sealer or tape on the sender. I bet I did. Odd though, because it's worked fine for a couple years. The wires are attached internally to the gauge, and are attached by nuts to the post(s) on the sender. Can I somehow (electrically ignorant here) attach a jumper negative wire from the sender to a ground? Or do I have to remove the sender and re-attach without sealer or tape?

 

[Buzz1969]

if you have a air compressor and regulator ( set at around 50 psi.) take the sender off get some fitting hook air to it and a jumper wire.

 

[zeke67]

You could do a jumper negative to ground to test whether the tefl has become a problem.