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Posted by: dax1969 Oct 18 2021, 01:43 AM

Hi guys,

Have some weird issues with my turnsignal lights on the dash.
Car is a 74 2.0 with the two arrows flashing at the same time. A while ago all of a sudden the brakelight warning light and turnsignal lights on the dash started flashing. Assumed the turnsignal relay failed so replaced with a uro one I had laying around. No change, I even had got a buzzing sound. Disconnected the single wire on the brakeswitch (at the MC) and the brake warning light went out but also I no longer had turnsignal lights on the dash. Everything outside works fine (left/right turnsignals, 4 way turnsignals, lights etc).

I installed a new brakeswitch, reconnected the single wire and once again installed a new turnsignal relay. Same issue, brakewarning light + L/R flashing. Disconnected the single wire to stop the brake warning light.

Now the flashing of the L/R light on the dash is intermittent. It looks like everytime I use the brakepedal the flashing stops.... Not only when braking, building up pressure, but realy as from the moment I touch the pedal .... Thought that perhaps I need to bleed the brakes (MC, no leaks) but it is kinda strange that the flashing stops even with a light touch on the pedal. I fried my brakeswitch on the pedal a couple of months ago and a new one is in.

Any thoughts ?

krgds
Dax

Posted by: Shivers Oct 18 2021, 06:49 AM

Reset the warning light switch: http://www.914world.com/bbs2/index.php?showtopic=293708&st=0&p=2394478&#entry2394478

1974 the turn signal light indicators on the tach flash at the same time, left or right, unlike my 72' that flashes only one side for a turn.

Posted by: dax1969 Oct 18 2021, 07:15 AM

QUOTE(Shivers @ Oct 18 2021, 02:49 PM)

Posted by: bzettner Oct 18 2021, 07:47 AM

My '73 1.7 had the exact symptoms last month after a tail light bulb went out. Are all of your bulbs in good shape?

Turn signal flasher did not help, actually made the flashing dash indicators flash more dimmly. I replaced the two spade MC switch with a reset-able single spade switch (914rubber IIRC) and this eliminated almost everything. The female spade connecting to my e-brake had "broken" and was having intermittent contact creating intermittent results.

@http://www.914world.com/bbs2/index.php?showuser=3031 was an incredible resource! Thanks, again @http://www.914world.com/bbs2/index.php?showuser=3031 !

Maybe this will help you.

Posted by: dax1969 Oct 18 2021, 08:35 AM

QUOTE(bzettner @ Oct 18 2021, 03:47 PM)

My '73 1.7 had the exact symptoms last month after a tail light bulb went out. Are all of your bulbs in good shape?

Turn signal flasher did not help, actually made the flashing dash indicators flash more dimmly. I replaced the two spade MC switch with a reset-able single spade switch (914rubber IIRC) and this eliminated almost everything. The female spade connecting to my e-brake had "broken" and was having intermittent contact creating intermittent results.

@http://www.914world.com/bbs2/index.php?showuser=3031 was an incredible resource! Thanks, again @http://www.914world.com/bbs2/index.php?showuser=3031 !

Maybe this will help you.

Posted by: Spoke Dec 3 2021, 07:45 PM

QUOTE(dax1969 @ Oct 18 2021, 02:43 AM)

Posted by: dax1969 Dec 7 2021, 09:00 AM

QUOTE(Spoke @ Dec 4 2021, 02:45 AM)

QUOTE(dax1969 @ Oct 18 2021, 02:43 AM)

Hi guys,

Have some weird issues with my turnsignal lights on the dash.
Car is a 74 2.0 with the two arrows flashing at the same time. A while ago all of a sudden the brakelight warning light and turnsignal lights on the dash started flashing. Assumed the turnsignal relay failed so replaced with a uro one I had laying around. No change, I even had got a buzzing sound. Disconnected the single wire on the brakeswitch (at the MC) and the brake warning light went out but also I no longer had turnsignal lights on the dash. Everything outside works fine (left/right turnsignals, 4 way turnsignals, lights etc).

I installed a new brakeswitch, reconnected the single wire and once again installed a new turnsignal relay. Same issue, brakewarning light + L/R flashing. Disconnected the single wire to stop the brake warning light.

Now the flashing of the L/R light on the dash is intermittent. It looks like everytime I use the brakepedal the flashing stops.... Not only when braking, building up pressure, but realy as from the moment I touch the pedal .... Thought that perhaps I need to bleed the brakes (MC, no leaks) but it is kinda strange that the flashing stops even with a light touch on the pedal. I fried my brakeswitch on the pedal a couple of months ago and a new one is in.

Any thoughts ?

krgds
Dax

@http://www.914world.com/bbs2/index.php?showuser=17103

The only place where the wires for the brake and turnsignals come together is in the rear light housing. Has any work been done to them? Sounds like wires were swapped.

When the flashing stops do the turnsignal lights stay on or off?

Posted by: JamesM Dec 8 2021, 02:09 AM

This is going to sound really simple but, have you checked your fuse panel? I have had similar oddness when accidently kicking out a few fuses.

Also, parking brake switch

Posted by: GregAmy Dec 8 2021, 07:49 AM

Couple things.

First, if removing the wire from the switch stops the problem, then it's possible you have either a bad master switch or even a bad master. Check for continuity to ground on that switch terminal with the wire removed; if it's grounded, then either the switch is bad or your master is bad (the shuttle is cocked over to one side.)

Remove that switch on the master and see if fluid comes out; there should not be any in that central chamber. Check the switch continutity with it removed; it should be an open circuit which then closes when you push in the pintle/pin. Look inside the switch hole and see if the shuttle is cocked over to one side; it should not be. If it is then it's possibly stuck in its bore, and the reaosn it's cocked over is possibly because one circuit of your master is bad.

Second, in reviewing the wiring diagram for a '74, the switch should be simply grounding the brake warning light when there's differential pressure in the master (one chamber bad). I can't see anything in the wiring diagram to indicate it would cause the turn signals to flash. So you may have some wiring crossed; possibly the flasher relay is being grounded to the master switch accidentally? Those gauges and its wires have been removed probably scores of times over the years so it's assuredly a possibility.

I'd suggest checking the master and its switch as I describe above and clarify that situation (especially in case you have a bad master) and then trace some ground wires from the back of the gauges down to that switch to see what's what.

Posted by: dax1969 Dec 8 2021, 10:03 AM

thanks for all the replies. Fedex brought me the easy install 19 mm master cylinder from 914rubber today. I will install it in a couple of day and report back.

When removing the switch a tiny drop of brakefluid comes out... perhaps the theory of a bad chamber in the old mastercylinder is the issue.

will keep you posted but it will take a few days...

bye for now and thanks again

krgds
Dax

Posted by: GregAmy Dec 8 2021, 10:21 AM

Dax, good update. I tend to agree that it's time for a new master anyway.

Still sounds like you could have a wiring prob - grounding that wire shouldn't cause the turn signals to flash - so don't hesitate to head that way eventually. At least in your case it shouldn't cause any issues for you until you do.

Posted by: dax1969 Jan 3 2022, 04:14 AM

Hello, promised to report back ...

As you could see in my other post I cleaned up my bottom (of the car ), installed rebuild brakes, new bushings on the a-arms and installed a new 19 mm master cylinder
and bled the brakes...

It looks like my issue with the turnsignals/relay is history... My stock 17mm mastercylinder seemed to be the culprit. Would have never guessed that.

greetings
dax

Posted by: Dave_Darling Jan 3 2022, 08:19 AM

If I had to guess, I would venture that the issue was a grounding problem with the master cylinder switch. The two-wire switch has the signal wire and a ground wire; the one-wire switch grounds through its threads into the body of the master cylinder.

It might be possible to fix this in the future by adding an extra ground wire to the master cylinder, possibly on a mounting bolt.

--DD

Posted by: StarBear Jan 3 2022, 08:24 AM

QUOTE(dax1969 @ Jan 3 2022, 05:14 AM)

Hello, promised to report back ...

As you could see in my other post I cleaned up my bottom (of the car ), installed rebuild brakes, new bushings on the a-arms and installed a new 19 mm master cylinder
and bled the brakes...

It looks like my issue with the turnsignals/relay is history... My stock 17mm mastercylinder seemed to be the culprit. Would have never guessed that.

greetings
dax