Temp Thermistor

[tractor]

as I only have one wire coming from thermistor to temp gauge can I just splice off this to take it to megajolt

[sj-bradley]

The other side of the thermistor will be grounded through the body so the wire you mention is the sense wire, so, yes.

 

Just make sure that the thermistor body is connected to the engine body or is grounded somewhere. I.e. don't put it surrounded by rubber hoses with no return electrical path.

 

Simon.

[tractor]

I am a wiz with soldering iron now might put a wire from thermistor body to ground just to make sure cheers simon

[sj-bradley]

It should be ok if it's bolted into a metalwork part on the engine. It's only a no-no if it's in the middle of rubber pipework or if you use too much PTFE tape that insulates the body too.

 

Simon.

Edited April 5, 2015 by Simon B

[tractor]

its fitted in the retroford water rail which is bolted to the head was getting reading to temp gauge already so should be ok

[sj-bradley]

Yes, that sounds fine.

[Longboarder]

Might be fun trying to calibrate it. You can't electrically disconnect it from the temperature gauge while you find values for known temperatures and they may also change as the gauge warms up. Definite step into unknown territory. Is it a daft question to ask why you choose to share functions from one sender rather than fit separate ones? Most OEM set-ups use two senders or one with ecu output giving the gauge signal.

 

Nigel

[sj-bradley]

It all depends on what the instrumentation is designed to do.

 

If the gauge, sender and ECU were designed to work together, then one sender would do all the work.

 

If the senders all worked the same way, then you could hang any ECU and gauge on them provided they have high impedance inputs and didn't load down the sender's circuitry.

 

But, in a real world there is no consistency to the sender output so you need to match sender and ecu and another sender with different output to a gauge.

 

Simon.

[tractor]

now you tell me

[keith kelly]

why do you need signal to megajolt???

[tractor]

cos megajolt adjusts advance at different temps

[keith kelly]

??? Does it ! Didn't read that bit

[keith kelly]

??? Does it ! Didn't read that bit