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Re: Low speed radiator fan still won’t work after resistor replacemnt Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Sun, 19 Sep 2021 13:52:17
In Reply to: Re: Low speed radiator fan still won’t work after resistor replacemnt, EndlessMike, Sun, 19 Sep 2021 13:29:58 Members do not see ads below this line. - Help Keep This Site Online - Signup
Something does not add up. If you hear the low speed relay click when engine is warm enough, it should deliver power to cooling fan just like when you bypass the 30 to 87 pin.
Saab wiring diagram is a little bit funky that when I wrote power to 85 and ground signal at 86. The normal standard for these relays is always trigger power at 86 and trigger ground at 85 so your test might be more accurate as for what the normal standard is and not what the Saab wiring diagram says when you have power at 30 and 86. But you do need to understand you when testing for ground signal, test light has to be connected to battery positive.
So when the low speed relay clicks on, your test light should shine when connected between battery positive and pin 85. That's the trigger ground from ICE.
When you remove high speed relay and connect 30-87 pins, can you hear a much higher speed then when you connected 30-87 pins on low speed relay?
Could you have wired in the resistor on wrong wires?
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