Mysterious switch...
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Had a good forage behind the dashboard of my "bitsa" S4 today, tracking down some electrical gremlins as I get it ready for registration.
One surprise was a momentary-action toggle switch that was hanging free, but tucked up into the loom so that it didn't hang below the dash. It's at the end of two blue/purple wires that I haven't yet traced, but I was wondering if anyone has thoughts on what it could be for... It doesn't seem to do anything as far as I can tell, and the only momentary-action switches I can think of on an S4 are the window switches. which need to have two "on" positions, not just one.
One surprise was a momentary-action toggle switch that was hanging free, but tucked up into the loom so that it didn't hang below the dash. It's at the end of two blue/purple wires that I haven't yet traced, but I was wondering if anyone has thoughts on what it could be for... It doesn't seem to do anything as far as I can tell, and the only momentary-action switches I can think of on an S4 are the window switches. which need to have two "on" positions, not just one.
1969 S4
1969 Europa S2
1990/1970 Ricciardi/Alfa
1969 Europa S2
1990/1970 Ricciardi/Alfa
- tjb0274
- Second Gear
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- Joined: 09 May 2018
It has not got an electric fuel pump as well as the mechanical one has it ? sometimes people fit them just to prime the carbs after standing a while.
.......or even an electric antenna ?
.......or even an electric antenna ?
Brian
64 S2 Roadster
72 Sprint FHC
64 S2 Roadster
72 Sprint FHC
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types26/36 - Coveted Fifth Gear
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I have a similar switch in my plus 2. When I push it, it lights up the brake failure light on the dash. I could never really figure out what it was for though. Was it really intended just to test that the brake light works?
- chickenstock10k
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chickenstock10k wrote:I have a similar switch in my plus 2. When I push it, it lights up the brake failure light on the dash. I could never really figure out what it was for though. Was it really intended just to test that the brake light works?
I think that was the case. I expect the Federal regulations required a way to test the warming light, and this was the easiest way to meet the regs without adding a relay that would light up the fail light prior to the engine starting or some such.
Does your S4 have the dual brake circuit? The warning light we have in the Federal Plus 2 is triggered by failure of one side of the duel brakes.
Stu
Stu
1969 Plus 2 Federal LHD
1969 Plus 2 Federal LHD
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stugilmour - Coveted Fifth Gear
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Thanks for all the suggestions and thoughts
Found out what it is yesterday - there was a bad connection and when that was fixed the mysterious switch turned out to be for the wipers - someone's idea for a driver-controlled intermittent, I guess.
The dash looks pretty new, so guessing the switch was mounted in a previous dash and then just left hanging when the dash was replaced
One of a number of things I'm sorting out with the wiring.
Found out what it is yesterday - there was a bad connection and when that was fixed the mysterious switch turned out to be for the wipers - someone's idea for a driver-controlled intermittent, I guess.
The dash looks pretty new, so guessing the switch was mounted in a previous dash and then just left hanging when the dash was replaced
One of a number of things I'm sorting out with the wiring.
1969 S4
1969 Europa S2
1990/1970 Ricciardi/Alfa
1969 Europa S2
1990/1970 Ricciardi/Alfa
- tjb0274
- Second Gear
- Posts: 59
- Joined: 09 May 2018
stugilmour wrote:I think that was the case. I expect the Federal regulations required a way to test the warming light, and this was the easiest way to meet the regs without adding a relay that would light up the fail light prior to the engine starting or some such.
I think that is correct. I once had a '73 Super Beetle in which I recall something similar.
1970 Elan Plus 2 (not S) 50/2036
2012 BMW R1200GS
"It just wouldn't be a complete day if I didn't forget something!" -Me
2012 BMW R1200GS
"It just wouldn't be a complete day if I didn't forget something!" -Me
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The Veg - Coveted Fifth Gear
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