PYU940F Posted May 23, 2017 Report Share Posted May 23, 2017 Took it out for an Italian service today and on the way back put the heater fan on. Moderate amount of extra heat but the fuel gauge went from 1/2 to full and the temp went from 40% to 95%. think may have seen a previous thread but is this: a) Dodgy heater fan motor (groan) Dodgy heater switch c) Voltage stabiliser d) None of the above Anybody had this? Ciao (the service worked so well I can now speak fluent Italian) SImon Quote Link to post Share on other sites
Z320 Posted May 23, 2017 Report Share Posted May 23, 2017 Che cosa e un servizio italiana? Ciao Marco Quote Link to post Share on other sites
PYU940F Posted May 23, 2017 Author Report Share Posted May 23, 2017 Servizio italiana? 100 Klicks at 4000 rpm Ciao Simon Quote Link to post Share on other sites
peejay4A Posted May 23, 2017 Report Share Posted May 23, 2017 (edited) Did the readings return to normal with the fan off? If so I'd suspect a wiring fault such that operating the switch is applying full 12v to the gauges. Out with the multimeter. Edited May 23, 2017 by peejay4A Quote Link to post Share on other sites
PYU940F Posted May 23, 2017 Author Report Share Posted May 23, 2017 Yep, turning the heater fan switch off the gauges slowly returned to normal over about 10 seconds Simon Quote Link to post Share on other sites
PYU940F Posted May 23, 2017 Author Report Share Posted May 23, 2017 maybe the Lucas and Jaeger gauges did not like the Italian treatment Simon Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 23, 2017 Report Share Posted May 23, 2017 Pull that switch, it's cheaper than petrol. Quote Link to post Share on other sites
Z320 Posted May 24, 2017 Report Share Posted May 24, 2017 Voltage for the heater fan comes from the input of the voltage stabilisator - if I remember right? Did not thouht this to it's end but I would take a short look on the batterie: did the italians change +/-. What was their work they has to do? Quote Link to post Share on other sites
Lebro Posted May 24, 2017 Report Share Posted May 24, 2017 (edited) How about: Could your heater be wired to the output side of the voltage stabiliser instead of the input side. If so turning on the heater would definitely screw up the stabiliser function, which would upset the gauges ? Even if not this it definitely sounds like a wiring fault somewhere. Bob. Edited May 24, 2017 by Lebro Quote Link to post Share on other sites
RogerH Posted May 24, 2017 Report Share Posted May 24, 2017 How about: Could your heater be wired to the output side of the voltage stabiliser instead of the input side. If so turning on the heater would definitely screw up the stabiliser function, which would upset the gauges ? Even if not this it definitely sounds like a wiring fault somewhere. Bob. +1 Roger Quote Link to post Share on other sites
PYU940F Posted May 24, 2017 Author Report Share Posted May 24, 2017 Thanks I am going for the voltage stabiliser. Is it easy to identify the input and output terminals? Or do I have to trace the cables/wires? Simon Quote Link to post Share on other sites
peejay4A Posted May 24, 2017 Report Share Posted May 24, 2017 (edited) If it's a standard one you should see 12V continuous on the input terminal and 12V on and off at the output. Refer to the wiring diagram for the colours, I don't have one at hand atm. Then switch the fan on and see what readings you get. Edited May 24, 2017 by peejay4A Quote Link to post Share on other sites
RobH Posted May 24, 2017 Report Share Posted May 24, 2017 Green wire 12v supply to terminal B. Light green with dark green trace - from terminal I to the gauges. Black earth wire to terminal E. Quote Link to post Share on other sites
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