92_348 turn signal issue

Hi Luigi!
I used your old 348 engine cover on the tree car! Many thanks, saved me mucho bucks!
If it's clicking real fast, there's a bulb not working (not enough resistance). Maybe a wiring issue since no bulbs are burned out. Isolate it by watching which bulb doesn't blink.
Bruce

 

Does the switch feel normal going into the righthand position? They tend to break at the end of the stalk. Flashers would still work.

 

If you can hear the clicking with a right turn, then there has to be a signal coming from the stalk. Assuming that the 348 is similar to the 355, I'd say that the flasher relay/unit is faulty. The output from the flasher unit is ok using the hazard switch, which uses the different wiring to the flasher unit, but the same wiring from the flasher unit to the lights (it's just processed differently inside the flasher unit). The hazard lights may not be affected in the same way as turn indications by high resistances in the lighting circuit by increasing the speed of the flash (Perhaps someone can confirm this next time they have a faulty bulb).

Electrical diagrams are found in the Workshop Manual

All Ferraris

Good luck with those diagrams. They seem a lot clearer than the F355 online diagrams, but are still broken up into 4 parts. I've just spent several days trying to convert the four blurry pdf files for the F355 into a single legible diagram, but it's still a work in progress. Some of the symbols are completely illegible and the diagrams use unfamiliar expressions, such as "cable multiplication" and "front shunt"

Cheers

 

It could be the flash relay playing up but that's easy enough to check and the relay is a pretty standard component.

It could also be due to the indicator column switch being broken internally. (These switches seem to be a bit fragile inside and prone to various parts breaking)

I had to replace the column switch assembly on My 348 as the indicator switch would not centre correctly after use, often leaving the left hand indicators still operating when the indicator lever was in the middle, and the daylight/headlight flash stopped working on the other stalk due to the plastic internals breaking.

It cost Me £995 ($1500) for a brand new switch assembly (I had to get it sorted to get the car through it's annual MOT test), and decided that a second-hand switch assembly was too much of a gamble.

The hazard warning lights operate off two mini-relays mounted behind the panel that the hazard warning switch is in and so all four indicators should still work if there are no bulb issues.

 

I stand corrected. Sounds like the 348 is completely different from the 355. Ignore my previous comments

 

Thank you for the update and conclusion.

One of the most frustrating things about car forum sites is when someone has an issue, gets suggestions off other site members but then never comes back to say what the cause and solution was, so again, thank you!