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29-07-2016, 04:33 AM
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No injector signal at gauge
04 Merc e55. Got a new hfs3 wired up but cannot get the fidc led to flicker on the gauge. Using a test light shows that my wiring is ok and the test light will flicker. I think either the gauge, grey gauge harness or the hfs module is no good. Is there a way to test and see the fidc light up (maybe the led is no good but the unit is not picking up the signal)?
Last edited by Mynewe55; 29-07-2016 at 04:43 AM. 
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