question ferret temperature gauge showing max (B60 engine)

[jim fl4]

Hi, before I investigate wondered if anyone might have experience with this fault. When ignition is off temp gauge needle is on cold, when ignition is ON needle flies up to max. Now, if this were an old car with an electric sender I would say its wire is simply running to earth, but in this case I don't know?

 

I've looked and the braided cable to the thermometer looks fine?

 

Thanks

 

Jim

[fv1609]

Jim if it reads maximum it is open circuit somewhere. A likely place is the connector to the thermometer head or the wires inside.

[jim fl4]

Hi Clive, I will check that out tomorrow.

 

Many thanks :-):-):-)

 

Jim

[fv1609]

Jim be careful disconnecting the connector from the thermometer head as it is easy to find yourself undoing the connector internals. Also check that the screened cable rests above the distributor heat shield if the cable is under the heat shield it can get cooked by the exhaust manifolds.

 

Also check the instrument panel end for the two cables to it are marked R1 NEG and R2 TEMP. The current flow through the circuit is about 40ma. The resistance of the thermometer is something like 180 ohms (depending on temperature!) I think.

[jim fl4]

Jim be careful disconnecting the connector from the thermometer head as it is easy to find yourself undoing the connector internals. Also check that the screened cable rests above the distributor heat shield if the cable is under the heat shield it can get cooked by the exhaust manifolds.

 

Also check the instrument panel end for the two cables to it are marked R1 NEG and R2 TEMP. The current flow through the circuit is about 40ma. The resistance of the thermometer is something like 180 ohms (depending on temperature!) I think.

 

Hi Clive, Had a look today and can report the following.

 

1. removed the connector to the thermostat, separated the two ends and checked - with ignition on needles flies up to max.

 

2. Clamped both ends together - result is the needle does NOT move.

 

3. reattached the wire ends into the sender, result needles flies up.

 

Does this mean its the sender (thermometer)?

 

Cheers

 

 

Jim

[fv1609]

Jim I think your conclusion must be correct. #2 shows that there is integrity in the two leads. Can you just put a multimeter on ohms & put it in the sender to confirm it is open circuit but it does look that way. Check that the sockets in the sender are clean & not corroded.

[jim fl4]

Jim I think your conclusion must be correct. #2 shows that there is integrity in the two leads. Can you just put a multimeter on ohms & put it in the sender to confirm it is open circuit but it does look that way. Check that the sockets in the sender are clean & not corroded.

 

Thanks Clive for your reply, I will try with the multimeter tomorrow and report back. Do you have any suggestions as to where to source a replacement sender...and headlight bulb :-)?

 

cheers

 

Jim

[Richard Farrant]

Thanks Clive for your reply, I will try with the multimeter tomorrow and report back. Do you have any suggestions as to where to source a replacement sender...and headlight bulb :-)?

 

cheers

 

Jim

 

Hi Jim,

I will jump in here, I am sure Richard Banister has stock of these senders, 01797 253211, thought I saw some there on Friday.

 

regards,

Richard

[fv1609]

Headlight bulbs here:

 

https://www.thexmod.com/item_detail.asp?id=3390

 

Sender is more difficult, thexmod have sold out:

https://www.thexmod.com/item_detail.asp?id=8900

 

Bannisters may have one. http://www.milweb.net/go/banister/

[jim fl4]

Hi Jim,

I will jump in here, I am sure Richard Banister has stock of these senders, 01797 253211, thought I saw some there on Friday.

 

regards,

Richard

Hi Richard,

 

Thanks for jumping in :-):-), will test the sender tomorrow, its probably duff and then ring the above.

 

Thanks for the lead :-).

 

Cheers

 

Jim

[sexton]

I've found temp senders measure about 100 ohms at room temp.

 

And I suggest confirming the R1-NEG wire coming out of the instrument panel is connected to ground, as well as the R1-NEG wire from the sensor. The wiring diagram shows this but I missed it and it had me scratching my head for a while.

 

Malcolm

[jim fl4]

I've found temp senders measure about 100 ohms at room temp.

 

And I suggest confirming the R1-NEG wire coming out of the instrument panel is connected to ground, as well as the R1-NEG wire from the sensor. The wiring diagram shows this but I missed it and it had me scratching my head for a while.

 

Malcolm

 

Thanks Malcolm, will do.

 

Jim

[jim fl4]

Bannisters do them but at a hefty £110 plus vat I'm not rushing in. Anyone got a good 2nd hand one?

 

Cheers]