mikex7

My 2000 has a strange problem. Left side brake lights don't work, but the blinkers and all other lights work fine. This makes me think its the multi function switch..

However, sometimes my blinker stops working and I need to push the hazard switch a bunch of times and it gets going again. But could a failing hazard switch cause this problem?

dgrant3830

I would be looking at the hazard switch first...any other indications?

mph1972

There is a relay you can buy that costs about $50 and it should fix this problem in about 20 minutes of installing. Someone should chime in or you can do a search on this, because I cann't remember exactly what the name is. I know a vendor on here makes them.

Micah

lucky131969

Curious to why the hazard switch would be suspect, when only the left side brake lights don't work? The stop lamp switch output, goes through the hazard switch, and supplies 12 volts (on a single wire) to BOTH left and right rears.

lionelhutz

Exactly, the brake light problem is not the hazard switch. The hazard switch could cause you to have the 3rd brake light only but not loss of brake lights only on one side.

So, you have 2 problems, the hazard switch causing your turn signals to stop working and the multi-function switch causing your brake lights to quit working.

Peter

mph1972

They are connected.*

Go ahead and pay top dollar or do the cheap fix I mentioned. *Up to you. *If you do the search and contact the vendor that supplies the relay he will tell you.

My buddy spent $900 at a steamers up getting the hazard switch, blinker switch and a battery replaced and it did not fix his issues. *I am not a mechanic, but I have had this problem in my 2000, 2001, a buddies 2000 and another friends 2001 and the relay fixed everyone. *$70 is a heck of a lot cheaper and if you are playing the guessing game, and that is what is going on here, because no one knows, $70 is a lot cheaper than the hundreds you may spend swapping everything else out and the install is less than 20 minutes. *http://www.corvette-enhancements.com/c5_flasher_fix.php contact them and tell them what is going on and see what they say.


It is just like the column lock by pass. *The recall came out never completely fixed everyone's problem, but the by pass worked everytime. *It only ran $70 and took 20 minutes. *It's crazy, but true.

Micah

lucky131969

Fair enough. Please show me on the schematic below, how the brake light circuit flows, and why it's possible....for the hazard swith to affect the left rear brake lights...and not the right rear.

BigGun

[QUOTE=lucky131969;1577167805]Fair enough. Please show me on the schematic below, how the brake light circuit flows, and why it's possible....for the hazard swith to affect the left rear brake lights...and not the right rear.

======================================== ============
Assuming you described your problem correctly, I would listen to Lucky. He knows his stuff better than anyone else on this forum.

lucky131969

[QUOTE=BigGun;1577167923]...thanks for the kind words; however, my knowledge pales in comparison to someone like Bill Curlee. I just try to offer my experience, coupled with my understanding of the schematics, to help people make a logical decison.

lionelhutz

You are playing the guessing game. Lucky and I are not playing the guessing game because the MFS is the solution for the problem that was described.

Peter

mph1972

You guys can show your flow charts and tell me what is what and I appreciate it sincerely, I am not an electrician nor a mechanic and only speak from past experiences when it came to this hazard switches and blinkers, as well as the break lights and that a new battery, replacement switch, column turn signal switch did not solve a similar problem. I hope you find out your problem. I am not taking anything away from anyone, I offered my advice on what fixed my problem as well as three buddies who had very like problems and the relay did the trick.

Good luck figuring it out and I hope it isn't a pricey repair. I also look forward to hearing what the fix was.

Micah

00Corvette

That's not a flow chart, it's a schematic..it actually shows how the DC current flows throughout the relays/wiring/switches/resistors from spot to spot when a given switch is flipped on/off(open/closed).

I don't know how to read them either but if it doesn't show the brake lights "flowing" through the hazard switch or it's relay..they're not connected.

Is the bypass that you're referring to the hazard switch bypass or could it be something different?


So, 4 people now at least with an issue where ONLY the left brake lights don't work??

@ the op...you're blinkers not working and then working when you push the hazard button a bunch of times definitely points you to having to replace the hazard switch OR do the bypass.

The brake lights I don't believe are connected so maybe a separate issue. I would do the bypass since MPH says it fixed his exact same issue cause you're going to have to either to that or replace the hazard switch itself to get your turn signals working without having to mess with the hazard button anyway.

lionelhutz

I love people that just "know" what must be the issue and the fix based on a fix fixing a similar issue yet also fully admitting they can't read a schematic...

FYI, the flasher bypass harness/wiring does nothing that would change the working of the brake lights. I posted the DIY bypass fix and it never touches any wire for the brakes.

If you look at the schematic above, the left side of the hazard switch shows a contact with a white wire coming in and a brown wire going out - that is where the brake light power passes through the hazard switch and it's one wire which is used for both the left and right brake lights. Further to the right is a pink wire and a purple wire - the flasher bypass connects to these wires.

http://forums.corvetteforum.com/1569256474-post48.html

Hmm, so do the flasher bypass to fix your intermittent flasher problem and then come back and tell us how you eventually replaced the MFS to fix the left brake lights.

Peter

mikex7

Thanks for all of the responses fellas, so this is what I need? http://www.vettenuts.net/index.php?l...t_detail&p=188

mikex7

Oh, another thing, when I turn my hazards on the left side doesn't work. Like I said previously, blinker does work fine...

lucky131969

Try something for me. Put the MFS in a right turn signal position, and see if the left brake lights work.

lucky131969

Here is the deal. From the hazard switch, there are two outputs to the MFS. The brown wire, circuit 27, is for the brake lights, and rear hazards. This means, if the right rear brake lights work, and the left rear brake lights don’t, it cannot be a problem with the hazard switch. The brown wire also flashes both left and right rears, when the hazard switch is depressed. If the right rear flashes with the hazards on, but the left rear does not, the problem is not with the hazard switch.


The purple wire, circuit 16, is for the turn signal flashers. This means, if the right rear turn signal flashes, and the left rear turn signal does not, it cannot be a problem with the hazard switch.

mikex7

Still no brake light

lionelhutz

You mean rear left doesn't flash? Same problem as the brake lights.

When you press the hazard switch the contacts inside connect the flasher to the wire that is normally used for the brakes (same contact on the left side in the schematic). So, both problems are the same issue with the MFS not passing the power from the brown wire to the left bake/turn lights (yellow wire). You posting the hazards also don't work on the left rear just helps confirm the issue.

Now, you also said the left signal works. Well, that uses the same wire back to the same bulb filaments as the brake lights would use. So, the signal working but the brake not working indicates the wiring is OK and the bulbs are OK.

You can test this by pulling the covers under the dash and unplugging the switch. Jumper the bown wire to the yellow on the car side connector and I bet the left brake lights will begin to work. I also bet the left will flash when you turn the hazards on.

Peter

lucky131969

Ok. Just checking. see my last post.