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no brake lights

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no brake lights #1
WilliamT William Trowbridge Sharon, CT, USA Sign in to contact 1964 MG MGB	Topic Creator (OP) Apr 26, 2024 05:51 PM Joined 6 years ago 49 Posts

The brake lights on my '64 MGB are not working. Could it be a fuse?

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Re: no brake lights #2
BH Davis Grosvenordale, CT &, Warren, VT, USA Sign in to contact 1968 MG MGB GT "Primrose" 1973 MG MGB	Apr 26, 2024 06:33 PM Top Contributor Joined 17 years ago 4,385 Posts

Removed.

Edited 1 time(s). Last edit at 2024-04-26 06:34 PM by BH Davis.

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Re: no brake lights #3
lgorg Larry Gorg Renton, WA, USA Sign in to contact 1966 MG MGB "Robbie"	Apr 26, 2024 11:31 PM Top Contributor Joined 12 years ago 3,348 Posts

On a 63, it more than likely is a fuse. Does the heater fan work or wipers? There are only two fuses, the bottom one is the horn. Everything else is on the top fuse. A word of caution, your ignition must be on for the brake lights to work. I've modified my brakes to come off the bottom fuse, so that the the ignition does not need to be on.

If only the brake lights are not working, first I would check the brake light switch on the right side just below the voltage regulator. With the ignition on, jump the two green wires to see if your brake lights come on. If still no brake lights, it may mean the lamps are burned out. I've seen this occur before where both lamps burned out at the same time.

Another item to check are the bullet connectors. Those should be pulled apart and cleaned.

If you need a wiring diagram, look at the Autowire wiring schematics. Diagram 1 is for 62 to 64 MGBs.

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Re: no brake lights #4
Windmill Jeroen G Penang, Malaysia Sign in to contact	Apr 27, 2024 07:42 AM Top Contributor Joined 3 years ago 804 Posts

On my 1964 car I once had a problem that the brake lights didn't work. Troubleshooting I discovered that the pressure switch, that measures the brake fluid pressure, did not work.
Diagnosing this was easy: take a piece of electrical wire and short circuit the two connections on this switch. This should activate the brake lights. If the lights come on you know that the switch is faulty. If the lights do not come on you know that the root cause is elsewhere.

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Re: no brake lights #5
JustMGB.com Colin Goodey Leicester, UK Sign in to contact 1967 MG MGB V8 Conversion 1975 MG MGB GT Jubilee "Pixie" 1981 MG MGB Limited Edition (LE)	Apr 27, 2024 07:59 AM Top Contributor Joined 1 year ago 80 Posts

The pressure switch is the most likely culprit.

If you check the feed to the switch for a 12v feed and if there is connect the two wires on the switch to see if your brake lights illuminate - if they do then you need to buy a good quality switch.

C16062 - Brake Light Switch

JustMGB.com www.justmgb.com

Hi MG World JustMGB.com are located in the UK and we are dedicated to selling only top quality, mostly UK manufactured, products.. We stock- Lucas Quinton Hazel AP Lockheed Borg & Beck Dynalite/Powerlite & many more.

C16062 - Brake Light Switch.jpg 38.6 KB

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