Calling all electrical gurus.... Hi, folks.. I've been trying to chase down an intermittent left hand turn indication on my F355 Spider for the last few months. I've been looking at the blurry online diagrams (and trying to redraw them) and found an unknown device in the right hand turn circuit inside the Hazard Switch (Wiring diagram Fig 8 in the Electrical section of Ferrari Workshop Manual F355 part 3). http://www.iinet.net.au/[email protected]/FerrariF355Spider/HazardSwitch.JPG Would anyone know what this is? I'm getting some strange resistance readings which may be attributable to this device i.e. different resistances depending on which multimeter probe (red/black) I put to earth. Looking at the diagrams, power is put on this device (via the LN-0.5 wire) when a right hand turn is initiated (i.e. a pulsed voltage at the same rate as the turn indications). ZN-0.5 appears to provide battery power to the switch (via the flasher relay). GR-0.5 provides power for the switch backlighting. N-0.5 is the earth wire. Thanks! Cheers Ian.
The right hand lamp circuit is acting like a diode (plus a small resistance). A tungsten filament in a bulb would not do this. Remember this is an old car, so no LED lamps for turn indications. Anyway, I did have a new bulb handy... Same result. It may have something to do with having the turn indicator on at the same time as the hazards and not upsetting the electronics (but that doesn't explain why this device is only hooked up to the right turn system). Anyway, the right turn indication is fine. It's the left one I have problems with I was messing with the right system to establish a baseline. Wondering if anyone has an original diagram? Thanks Cheers Ian
Correction. The LN-0.5 wire goes to the left hand turn circuit. Back to the drawing board... Something else must be causing this diode effect in the right hand circuit.
It looks like what you marked on the diagram as "light" and "diode" is actually an LED diode with its resistor for the switch backlight. The "????" appears to be the flashing bulb.
Thanks! You are 100% correct I was so worried this was causing my turn problem, I pulled the hazard switch apart (before I knew how expensive and hard to find they are). I think they've been superseded by P/N 229350. I discovered that the diode in series with the (incandescent) lamp was faulty, so I soldered in a new diode. I don't recall the hazard switch ever flashing, so hopefully this diode replacement will fix this (still putting the car back together). Unfortunately, all the parts are soldered in, so it got a bit fiddly (a few hours work). Here's a revised diagram.... The manual actually shows the parts around the wrong way, but it doesn't affect the operation. http://www.iinet.net.au/[email protected]/FerrariF355Spider/HazardSwitchSymbologyF355.GIF (EDIT) I see that the flashing incandescent is hooked up to the left turn system (The Hazard system, of course, activates both left and right) Cheers
The diode for the bulb should be 1N (not IN). The symbol shown for it is a rarely used one, possibly to differentiate from the LED symbol which is not quite correct on the schematics (your drawn diagram shows correct one). What looks like an arrow on the symbol for the bulb diode should be just a line (as on the drawing below), possibly just a smear caused by poor copy. Image Unavailable, Please Login
Excellent, thanks! I've modified the mini-diagram. Sounds like you'd be just the guy to help me with my master plan : )))) http://www.iinet.net.au/[email protected]/FerrariF355Spider/FerrariF3551994LightingDiagram.gif It's still a "work in progress". Thanks again Cheers Ian
Fantastic work Ian. I have the following suggestions to the instrument cluster part of the diagram: 1. Your top ? - the two small circles with "x" inside are inline connectors (the correct symbol is on the pic below) 2. Your left ? - the first wire to the left of the "+" wire is "SIGNAL" (SEGN. for "SEGNALE"), should be the signal that drives the speedo needle; the "TRIG" refers to the second wire to the left of the "+" wire, I have no idea what it means (perhaps speed or mileage feedback signal to the ECU) 3. Your middle ? - the "+" at the left wire is for positive supply, the "1" must be for the engine speed signal to the tacho 4. Your right ? - symbol for the rheostat for adjusting the intensity of the instrument illumination (see the correct symbol below) 5. The two wires (points) at the "water temp" should be: left "+", right "-" (power supply to the oil and water gauges) 6. The "COM" at the oil and the water gauges probably means signals from the senders Image Unavailable, Please Login Image Unavailable, Please Login
Thanks again, Miroljub. I'm learning something new every day Diagram updated. http://www.iinet.net.au/[email protected]/FerrariF355Spider/FerrariF3551994LightingDiagram.gif Hopefully I can add locations for some of the items on the diagram. I just have to figure out where some of these items are. I just spent 8 hours trying to find the earth for a left hand turn side repeater light (without luck). Cheers Ian.
