348 spider instrument cluster blinks with right turn signal

Interesting.

- What do you mean by "Exterior lights indicator blinking at dash(hazard lights)"? Indicator lights for Exterior Lights and Hazard Lights are different. Do you mean indicator light #7 on the diagram below?

- What do you mean by "Rear brake lights flashing(4 bulbs, 2 each side)"? If you are referring to two smaller rectangular lights at the top of the tail lamp, these are not brake lights. Please mark on the picture below what exactly you mean.

You have yet to reply the questions I posted earlier:

1. Did the car already have this issue when you bought it?
2. If not, what work was done on the car immediately prior to occurrence of the issue?
3. Do your Park/Side Lights come "on" at first turn of the lights column switch?
4. Is your "K" relay clicking when the instrument lights are blinking with the right turn signals "on" (put your finger on the relay to feel clicking)?
5. Does the Exterior Lights indicator light (#7 on the diagram below) come "on" at first turn of the lights column switch?
6. Does the High Beam indicator light (#8 on the diagram below) come "on" when you switch on the High Beams?

Image Unavailable, Please Login

Image Unavailable, Please Login

 

Here's a key for the rear lights (USA) if you don't know how to edit photos:

Image Unavailable, Please Login

 

@m.stojanovic Miro, if the fuse was pulled for the voltage checks, does that mean that the B relay ("K") coil is turning on and off?

It's interesting to see that the coil of the B relay uses key power, but also is provided with a ground via the steering column sidelight switch. i.e. the same ground ("122") used by the instruments and the flasher module.

 

Possibly but the pulsing (blinking) 12V might somehow be coming from the other side of the fuse. I am not sure whether the "bottom of the fuse socket" connects to the relay "b". Looking at the layout, it is more logical that the "top of the fuse socket" connects to relay "b". It is better to find out directly whether the relay "b" is clicking.

Yes, this is why I asked Eric to inform whether the indicator lights for Exterior Lights (#7) and for High Beam (#8) are working, at one turn of the light switch and when the High Beams are "on" respectively - to verify whether the ground point 122 is good.

 

Ian, something to look at:

You diagrams for "Lights" (Fig 6) show that pin 86 of the relay "b" connects to ground via the lights column switch. This is contrary to the "convention" that relay pin 85 connects to ground but it is how pin 86 of the relay "b" is actually wired in the 348's relay box.

On your diagrams for "Instruments" (Fig 4a, 5), you have shown that pin 85 of the relay "b" connects to ground via the lights column switch which, I believe, is in line with the (rather blur) diagrams for instruments that are available.

Perhaps you should amend your "Instruments" (Fig 4a, 5) diagrams to also show that pin 86 of the relay "b" connects to ground via the lights column switch. I have physically checked connections of pins 85 and 86 (and of other pins) of all relays on my 1991 RHD 348 and produced the layout shown below (rotate by 180 deg. for LHD) (you can ignore the diode symbols). It should apply to all models as it appears that there is only one part number for this relay box.
Image Unavailable, Please Login

And for the relay box in the trunk:
Image Unavailable, Please Login

I found discrepancies for a number of relays between what the diagrams show for pins 85 and 86 (which goes to "+" and which to ground) and how they are actually wired.

 

Or this:
Image Unavailable, Please Login

 

Here's a new 4b (instruments USA)

https://www.dropbox.com/t/G9iNWLwiyvkV2Yp2

and a new 5 (instruments Euro)

https://www.dropbox.com/t/MGSbzfew3MvIwoZQ

 

Curiouser and couriouser.... The brake lights seem to be completely independent of the other lights.... other than
1) power is supplied by relay "e" (key relay). I think you'd have a lot more issues if that relay was "flashing". Have you started the car recently?
2) shared grounds for the tail lights.

Re 2), I did have an issue with flashing brake lights (when the turn signals were on), but it was only one one side. It was a ground issue, but there are separate grounds for the left and right rear lights.

Do your windshield wipers operate normally? The brake lights and wipers share a common fuse.

 

Do you know if you have LED annunciator lights? I'm wondering if the LEDs are breaking down and causing intermittent shorts.

These flashing (LED?) fuses seem like a good idea, but I'm worried that they add an extra level of complexity which makes electrical issues hard to diagnose???

 

oh... not good... but good that you found it. So a short somewhere.

So the top, inboard (actually 2 lamps on each side). Those are in parallel with the lights on the side of the car and the licence plate lights. Powered by fuse 10. Did you replace the fuse before you took that photo of your lights?

Unfortunately, there are lots of items on fuse 10. Even the HVAC ECU is on fuse 10. It also powers the luggage compartment light (illuminates with the exterior lights turned on). A short could be anywhere. It will be hard to isolate.

I guess that's some progress. I'm wondering if the flasher module itself doing something strange. I can't see how it could blow fuse 10 though or how it could interact with the other lights.

 

So power is getting to the lights even though the lights should be powered by the fuse/relay. I'm just worried that your car may be wired differently. Is it a late model spider?

See this thread:
https://www.ferrarichat.com/forum/posts/145399434/

 

I asked earlier whether the indicator lights #7 and #8 come "on", at first turn of the lights column switch and when you switch on the High Beams respectively. This meant when only operating the lights switch, without switching the turn signals "on". Is this how you performed the test for these two lights? If not, test again as mentioned and let us know. If neither light #7 nor light #8 comes on when tested as I mentioned, it would suggest a problem with the grounding point #122.

 

If your side markers are rectangular, they should not blink. If they blink with the turn signals, it suggests that someone has added some extra wiring in an attempt to, in addition to their marker (side lights) function, make them also blink with the turn signal lights. It is not possible to achieve this by simply linking the existing side marker line to the turn signal line. If one wants the side markers to blink, one would have to disconnect the existing "side marking" line from the bulb and connect the bulb only to the turn signal line.

I have seen someone selling an electronic gadget which is added if one wants to have both functions, the side marking and blinking when the turn signals are "on".

I suggest that you, as the first step, have a good look at the wiring going to the rectangular side markers. Try to identify any suspicious additional wiring there. It is also possible that you will find the mentioned "electronic gadget" inserted in the wiring to the side markers which may have originally worked well but later failed causing the problem.

 

Miro, the rectangular side markers are spliced to the front/rear markers (on US cars) which are also flashing. The inboards shouldn't be flashing either, but they are. Whether it's a symptom or a cause, I don't know.

Do all these flashing lights appear when you use the hazard switch (key on/off)?

 

I can't figure out how a fault with grounding point 122 would cause fuse 10 to blow.... or are we dealing with two faults here?

 

When you removed the flasher module, all the external lights and internal lights stopped flashing. It is possible that the flasher module (or wiring) is supplying that power, but only with the RH flasher operating. There may be a short between the RH flasher wiring and the fuse 10 items, but it could be anywhere (instrument panel, fuse panel, front/rear light assemblies, etc).
The notes on my lighting wiring diagram suggest that one of the front lamps has multiple functions... park, marker & turn. Is it possible that someone has forced the wrong bulb into the socket, causing a short between the turn and the sidelight system? There was an epic thread on a lighting issue last year which was caused by some dodgy wiring in one of those front light assemblies.

If the passenger side marker is not flashing, there could be an issue there (see also Miro's suggestion). The markers should all be wired together, so you would think that all would flash.