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wiring standard gu tb45 temp gauge to td42

Posted: Sat Mar 19, 2011 11:12 pm
by lozz_ti
hi,

i have just done an engine conversion on my gu from a tb45 to a td42 and want to run the standard temp gauge. i have read wiring diagrams and info from a work shop manual and it doesn't give me enough info to wire it to the temp gauge to the motor.

in the picture below i have circled the temp gauge on the back of the dash. i have worked out which wires i need to use but i don't know where to connect the cos+ and the sin+ wires.

does cos+ stand for constant power and does sin+ stand for signal or do they have a totally different meaning and where do i connect them to?

also on the td42 it has two temp sensors. one is a two wire sensor and the other is a single wire sensor. why does it have two sensors? do i need to have them both wired to the temp gauge to make it work correctly?

Image

and info would be great.

thanks, lozz

Re: wiring standard gu tb45 temp gauge to td42

Posted: Sun Mar 20, 2011 6:06 pm
by lozz_ti
got it sorted today.

lozz

Re: wiring standard gu tb45 temp gauge to td42

Posted: Fri Apr 01, 2011 7:08 pm
by prawn
hey mate, I have done the same conversion. What did you have to do with the wiring, did you use the diesel or petrol sender.

Re: wiring standard gu tb45 temp gauge to td42

Posted: Sun Apr 03, 2011 9:32 am
by lozz_ti
after reading the workshop manual i had, i found that a yellow wire with a red stripe goes down to the ecu. i ran a wire from the temp sensor to that yellow wire with the red stripe and joined it down at the ecu plug. i did take a photo of it but can't get it off my phone. but if you find that wire at the ecu plug and then do a continuity test up at the plug on the instrument cluster to make sure you have the right one. i will find out which plug and what pin it is and let you know.

i have used td42 temp sendor but will be running an aftermarket gauge to make sure the standard gauge is reading correctly.

i still haven't worked out what the second temp sendor with the 2 wires is for. to make the temp gauge work it only needs the temp sendor with the single wire.

hope that helps, lozz