Oil Pressure Sender Problems

[samatulich]

Like I said in your other thread, I’m going through the same exact thing with my ‘76 Forty. Glad to read that everything thing is now working properly. My temp gauge has been working intermittently, no movement while driving, but when I stop and restart the vehicle the gauge climbs up and then falls again. Maybe I’ll also order a new OEM unit from @RAGINGMATT.

 

[bj40green]

Cruiser Corps was out of stock on new OEM senders. I got a refund from them and sourced a new OEM sender from @RAGINGMATT. I installed it and the new wiring harness from him this weekend. Everything works perfectly now.

2 questions:
What do you think was the problem? The sender or the wiring?
Can you tell the difference between the Sender from Cruiser Corp and the one from @RAGINGMATT ?

Rudi

 

[ToyotaMatt]

Is there a ground wire in the harness that you plug into for those later sending units? I guess you could just add a solo ground a wire to retrofit the older trucks with the newer sending unit.

Is there a ground wire in the harness that you plug into for those later sending units? I guess you could just add a solo ground a wire to retrofit the older trucks with the newer sending unit.

There are 2 senders that both work. The "old" ones are grounded by the housing.
View attachment 1824038 83520-55011

Mr. T figured the ground problem out and modified the sender.

The later ones have a Male spade ground tab. Now you can use all the teflon you want if you use te ground tab.
View attachment 1824036 83520-35020

Here is how to test your sender. You can use your test light for this.
View attachment 1824047


Oh, and do yourself a favor....... buy OEM. They are not expensive.

HTH,

Rudi

Thank You Very much for your valued input Rudi & dedicated time diving deeper then most into the why's & how's of the various Topics u cover here on MUD !


The OEM topic :

- Toyota has more then Several different part #'s for Land Cruiser Oil Pressure sending units , and the reasons are puzzling , to me at least

- u have a siamese F

- a F

- 2F without oil cooler

- 2F with oil cooler

- 2F without oil cooler but w/ extra ground tab

- 2F with oil cooler w/ extra ground tab

- there are additional part# applications as well too

- assuming Rudi is right , and he usually is , then the ground tab was introduced along with the updated 50a AMP cluster meter in 1/79 ?

- if we recall the oil sender was on the drivers side down low by the block drain of the early F engines , and then moved to the passenger side front on the 2F near the oil filter

- I have also see a late Model F say 1973 - 1974 with a sender up high , attached to the remote oil filter housing that was attached to the intake manifold , don;t know if this was factory or Not but it was a OEM sender for sure . maybe that's a different part# too ?



all the above have different toyota part #'s , why ? im gonna ask Rudi

 

[ToyotaMatt]

mean while ,

i hand made a final design working prototype Oil sender w/ ground tab repair connector harness kit


- 18ga Gauge yellow w/ black tracer wire for oil sender copper Button terminal grey connector

- 18g Gauge white w/ black tracer stripe Dedicated ground wire for the male spade terminal on the LATER oil senders

- to be clear this is for the later ground Tab equipped oil senders only ,


- to help avoid the connector mismatch issue , i installed a white female connector on the white w/ black tracer ground wire , hence white on white

- the yellow w/ Black tracer button terminal remains unchanged grey

 

[ToyotaMatt]

 

[reddog90]

2 questions:
What do you think was the problem? The sender or the wiring?
Can you tell the difference between the Sender from Cruiser Corp and the one from @RAGINGMATT ?

Rudi

To be honest, I'm not exactly sure what was wrong. I do think it was the sender and not the wiring though. I ran a test light to my original stripped wiring while trying to diagnose what was wrong and the gauge worked. So I knew the problem wasn't my old wiring or gauge. The new harness is very nice. I could not tell a difference between the senders from CC or Matt. They were both the same OEM part number as well (83520-35032 w/ oil cooler).