quote:
Originally posted by merrill
SO, ordered and received a new thermo time switch from autohaus az today.
I thought I should test the unit before installing. If i understand correctly, at temps above 35 deg c the switch should "open" and the circuit should not work.
using a test light I connected the terminals, one to plus and one to neg. put the unit in 60 deg c water and waited and waited and waited.
the test light was on the whole time. I thought the light would go off once the unit reached 35 deg c.
do I have a defective unit? I verified the body of the TTS was up to 41 deg c before quitting.
at temps below 35 deg c. the light stayed on as well so nothing changed when the temp changed.?
matt
Matt
66 230 sl - "white"
78 300 D - Blue
98 C230
matt
That's not how it works. The thermo/time switch grounds the injector relay for aprox 8 seconds when cold and less time as the temp increases.
The "simple" test is to connect the switch housing to ground, attach a test light to the terminal with the larger screw and to the + terminal of the battery. the starter connects to the small screw terminal. connect power to the testlight and the small termal at the same time. When cold the lamp should stay on for about 8 secs and drop off the time it ramains on as the temp increases to 35deg C.
Because this is an electro-mechanical switch the heating coil inside the switch has to cool for about 30 seconds between tests.
Also when installed in the car, the same holds true, The cold start injector will not operate a second time untill the heating element inside the switch has had time to cool down.
I hope this answers your question
Al
113-042-10-014715
built 11 Jan 66
904/396 blue, Ivory Tex
condition- rust bucket
Download Attachment: 
th time sw test.jpg66.45 KB
