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Unread 11-15-2012, 02:59 PM   #11
Gone Wild
 
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Default Re: Club Car Brake Lights Stay On

I sketched out a circuit diagram of how I think the system is wired. (attached)
The key switch would be located somewhere in the +12V dc circuit that goes to the brake lights.
Note that the brake pedal switch allows 48V dc to be applied to the brake relay which closes the N/O contacts and applies 12V dc to the brake lights.
If the contacts in the brake relay were "welded" closed, and the key switch, in the 12V circuit, was ON, the brake lights would illuminate without the brake pedal switch being activated. DRAWING IS HOW I THINK THE CIRCUIT WORKS. Tahoe is the expert. I'm just an old required guy with some experience with circuits....and time on my hands!
The one thing that does not fit with the "symptoms" is the fact that the brake lights go off when the brake switch is disconnected. That seems to indicate that there is a problem in the brake switch itself which is what Tahoe has been saying. My point is simply that it appears to me that a bad relay by itself could in fact cause the brake lights to stay on when the pedal switch is disconnected.
One other possibility is that there is a 4 minute or so timer in the circuit. Press the brakes with the key on, leave everything as is for 4 minutes or so and see if the brake lights go off. That would be normal with some timers.
Attached Images
File Type: jpg Brake Light Circuit Diagram.jpg (120.8 KB, 0 views)
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Unread 11-15-2012, 09:31 PM   #12
Dawg Gone Wild
 
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Default Re: Club Car Brake Lights Stay On

You're close, but not completely correct LJ12530. There are two switches in this circuit. The relay and the pressure switch on the pedal. The lights won't illuminate unless both of them are closed. The reason the lights turn off when the pressure switch is unplugged is because you open that circuit. If the lights are staying on there's no way a relay switch can cause that. It's a pressure switch issue. Also, there is no timer with the pressure switch systems. Only with the earlier style Precedent brake light systems.
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Unread 11-15-2012, 10:04 PM   #13
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Default Re: Club Car Brake Lights Stay On

My diagram does have two switches. The one for the pressure switch on the brake pedal, and the one via the contacts in the relay. They are both shown as N/O in the diagram. There would also be an ON/OFF switch somewhere in the 12V circuit. I was trying to show that were I to jumper the output (not the coil) of the relay ( or have stuck contacts ) ....while having the key on, the pressure switch does not have to be closed since it is not in the 12V circuit that powers the tail lights. I have not verified that but if get bored tomorrow (retired!) I'll play around with the relay output and see what happens.

Did not know about the change to only pressure switches. I've seen a few (very few compared to you) different switch arrangements, but they were on older Precedents.

Funny thing...today when I stopped the cart...the brake lights stayed on. I tapped the brake pedal and they went off! I do have a pressure switch on my 2009 Precedent so they definitely are not foolproof switches to say the least.

Thx for all the time you spend responding to posts. You have more golf cart knowledge than I ever WANT to have!!
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Unread 11-16-2012, 11:19 AM   #14
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Default Re: Club Car Brake Lights Stay On

I certainly appreciate all the information. I removed the pressure switch from behind the rubber pad on the brake pedal. While doing it, occasionally the brake lights would flicker. That suggested to me the pressure switch is bad. I went to the local club car dealer and the pressure pad was $87 so I opted to just disconnect it and drive without brake lights. All the other lights work fine, just no brake lights. Just didn't want to spend $100 for the part. TahoeDawg has suggested that the switch is difficult to install and "calibrate" for the correct pressure from the brake pedal. The brake lights were drawing down the batteries causing some difficulty. Everyone is good, just no brake lights. Again, thanks for all the information.
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Unread 11-16-2012, 05:29 PM   #15
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Default Re: Club Car Brake Lights Stay On

Quote:
Originally Posted by txjay View Post
I certainly appreciate all the information. I removed the pressure switch from behind the rubber pad on the brake pedal. While doing it, occasionally the brake lights would flicker. That suggested to me the pressure switch is bad. I went to the local club car dealer and the pressure pad was $87 so I opted to just disconnect it and drive without brake lights. All the other lights work fine, just no brake lights. Just didn't want to spend $100 for the part. TahoeDawg has suggested that the switch is difficult to install and "calibrate" for the correct pressure from the brake pedal. The brake lights were drawing down the batteries causing some difficulty. Everyone is good, just no brake lights. Again, thanks for all the information.

$87 is absolutely ridiculous. NO reason it should cost that much. Also, I'd look for other things as the issue with your batteries dying. Those LED taillights pull VERY little power. It would take for EVER to kill your batteries with those lights.
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