I'm having an issue with my headlights on my 360. The lights turn on fine but after about 10 minutes the headlights start to flicker and after about 1 minute of this, they go out completely. I can turn on the high beams but after about 2 minutes, the same thing happens to them.
I made a 'quick and dirty' test apparatus to see if the problem was on the signal side of the relay or the power side of the relay. The problem appears to be on the signal side. I confirmed this by forcing the main beams on with a jumper wire and driving the car for 1/2 hour with no issues.
Does anyone out there have any ideas or experience as to the most likely culprit? I've checked the wiring diagram in the service manual which only marginally helped.
Thanks, netman! I did a little more testing this morning and have it narrowed down to the signal circuit on the +15 services relay behind the drivers seat. This relay supplies the signal power for the headlight relays up front.
I've looked at the wiring diagram again. Ferrari saw fit to not publish the S172H splice connections. I guess I'll need to hunt it down and find out how many there are and where they all go.
OK, so I spent today disassembling the wiring harness stuff and I'm still stumped. All the splices, connections, and wires appear to be in good order. The relay is new and still after ten minutes, it's all chatter.
One thing that has me confused is the negative side signal to the services relay. The wire is also the power for the starter motor soleniod. (Honest, I checked it physically) It's as if the starter solenoid acts as a ground when the starter motor is not being used to start the car. Can someone confirm this? There is a lot to be gained if this is the case since I've also had an intermittent 'no start' issue when the car is at full temperature.
OK, for those who are interested, I finally got this intermittent headlight issue solved.
Up to this point, I had figured out where the problem was (ground signal +15 services relay) but not why. My last point to check was the starter itself. This serves as the ground for the +15 services relay when you're not using the starter motor.
When I got to the starter, I was shocked to see that of the three structural fasteners that should have been holding the starter to the eng/trans assembly, only one was there. This single nut was not even finger tight.
I pulled the starter off anyway to check the internals. I resoldered the solenoid coil leads on principle and installed the starter with all the hardware. Problem solved.
Ferrari really uses some silly functionality. This is on par with sensing the brake light circuit to allow the F1 transmission to go into gear instead of using a second contact on the brake light switch -- really stupid.
I'm trying to be positive about this experience. The design is clever in the simplicity. By connecting things this way, you force as much power to the starting of the car as you can. (The lights and cooling fans are forced off during start up) However, if you don't expect the systems to be interconnected it can be a bugger.
The other positive is that I believe my intermittent hot 'no start' issue may also be solved. I wouldn't have gotten to find that if Ferrari had done things some other way.
OK, enough of this cheerful crap. Now I've got to put together a PowerPoint to explain to the guys that serviced my car why they owe me the cost of the light bulbs they put in my car to 'solve' the problem.