New Temperature Sending Unit issues

[madurodave]

Hello. I searched for this issues with no luck. My engine SN is 0L687849, 5.0 220HP.

Replaced sender as gauge not working. I verified gauge operational by grounding at the sensor.....and it did peg out. I also verified that I do indeed have the correct sending unit installed.

What am I missing here? Also, I am curious how to test the alarm.

Thanks in advance for you help.
Dave

 

[rbh]

Re: New Temperature Sending Unit issues

check the sender when it is screwed into block, do you have a good contact?
as the outside threads on the sender need to be touching(grounded) to the block to work. use a multimeter and check for high ohms resistance. The higher the ohms the less good contact you have, possibly you have to clean the threads.
And is your block well grounded to the negative battery cable?
and are your connections at the battery clean and tight?
just a couple of thoughts
rob

 

[madurodave]

Re: New Temperature Sending Unit issues

check the sender when it is screwed into block, do you have a good contact?
as the outside threads on the sender need to be touching(grounded) to the block to work. use a multimeter and check for high ohms resistance. The higher the ohms the less good contact you have, possibly you have to clean the threads.
And is your block well grounded to the negative battery cable?
and are your connections at the battery clean and tight?
just a couple of thoughts
rob

GREAT FEEDBACK!! Thanks! Going to check!

Also, can you tell me where the ODB plug is located?

 

[Don S]

Re: New Temperature Sending Unit issues

can you tell me where the ODB plug is located?

What's an ODB plug

 

[madurodave]

Re: New Temperature Sending Unit issues

What's an ODB plug

On-Board Diagnostic port so I can read the codes?

 

[Don S]

Re: New Temperature Sending Unit issues

On-Board Diagnostic port so I can read the codes?

If the serial number you posted (0L687849) is correct, it's a carbed engine and does't have a DLC (Data Link Connector).

 

[madurodave]

Re: New Temperature Sending Unit issues

If the serial number you posted (0L687849) is correct, it's a carbed engine and does't have a DLC (Data Link Connector).

Thanks so much! Much to learn!

 

[madurodave]

Re: New Temperature Sending Unit issues

hummmm... ground seems to be fine The warning buzzer does not work either. Could this be related? As you know, the warning buzzer switch is directly across from it on the thermostat housing and connected together as well. I will snap a picture of this in the morning for your review. thanks

 

[rbh]

Re: New Temperature Sending Unit issues

pull gauge panel,redoo terminal connecters, gauge and alarm, as well as the point they splice out.
check for 12 vdc on terminal
rob

 

[madurodave]

Re: New Temperature Sending Unit issues

pull gauge panel,redoo terminal connecters, gauge and alarm, as well as the point they splice out.
check for 12 vdc on terminal
rob

Will go out there and do this. Please note that the temperature gauge did peg out when I grounded at engine.

 

[rbh]

Re: New Temperature Sending Unit issues

good morning-
you did make sure the sender was the right one for your gauge?
some will not work, diffrent mfgs, as well you did check the reistance from your batteries neg to the block and it was good
rob

 

[Don S]

Re: New Temperature Sending Unit issues

If you can ground the wire on the sender and the guage pegs, then your wiring is OK.
Only thing left is the sender itself. OR, the sender is not making good contact with the engine. You didn't use teflon tape on it did you? That would not allow the sender to ground through the threads.

 

[madurodave]

Re: New Temperature Sending Unit issues

good morning-
you did make sure the sender was the right one for your gauge?
some will not work, diffrent mfgs, as well you did check the reistance from your batteries neg to the block and it was good
rob

Good morning, Rob. I called the dealer yesterday to confirm I had the right sender. I gave them the SN and asked them to tell me the PN needed and it was indeed correct. This scenario makes me think the original sender was probably ok.

So far this morning I have checked the connections on the gauge and all seems to be operational. Will check the resistance. I really appreciate your help, Rob!!

 

[Dshow]

Re: New Temperature Sending Unit issues

If you have a digital multi-meter, what resistance are you getting directly across the sender when it is at room temp? If the sender is ok, then what resistance are you measuring when go from sender input on the gage to gage gnd? Those numbers should be very close.

 

[Don S]

Re: New Temperature Sending Unit issues

 

[rbh]

Re: New Temperature Sending Unit issues

go for the engine block ground, do you have a grounding plate were lots of grounds come together? check that and clean as well as the battery connections and posts, CLEAN AND TIGHT.
rob

 

[Don S]

Re: New Temperature Sending Unit issues

One would think if he had loose or corroded battery terminals, he would have more problems than just a temp gauge inop.

 

[madurodave]

Re: New Temperature Sending Unit issues

If you can ground the wire on the sender and the guage pegs, then your wiring is OK.
Only thing left is the sender itself. OR, the sender is not making good contact with the engine. You didn't use teflon tape on it did you? That would not allow the sender to ground through the threads.

No sir. In fact it came with some a little red tape or something already on the threads. I will remove and install to ensure good contact. And thanks for that reference. I had it printed last time to test the sender and will here in a bit.

Will let you know, dshow.

 

[madurodave]

Re: New Temperature Sending Unit issues

go for the engine block ground, do you have a grounding plate were lots of grounds come together? check that and clean as well as the battery connections and posts, CLEAN AND TIGHT.
rob

I traced neg on battery to engine and it looks very clean. I will loosen and clean up just to be sure. Only 1 large wire coming from batery negative and one small wire on the block ground stud.

PS - Laptop in boat and iboats.com are a MUST! You guys don't know how much I appreciate the guidance.

 

[Don S]

Re: New Temperature Sending Unit issues

Just test the connection with an ohm meter. You should show no resistance from the base of the sender to the block.