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  #1  
Old 08-31-2021, 10:33 AM
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drcom drcom is offline
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Join Date: Oct 02, 2011
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Brake Light Switch for the 70 Wagoneer WHERE ?

Wow, I feel like it's a question a day for me this week. I have no brake lights. Bulbs are good. I have read the O Jeep parts manual and looked at the 1974 Technical manual. When I search the auto parts store, it shows a hydraulic switch. One would think it goes into the bottom of the master cylinder. But there isn't one. Just a plug. I don't see the wires that would attach to it if the previous owner just plugged it and did not put the switch in it. Can someone confirm 1) It is the hydraulic version, not the electric under the brake area version and 2) what does the plug in electrical cap look like.....I promise, this is my only question today as I am wore out.
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1970 Wagoneer Custom (9/1969)
Original Arizona Jeep
Buick 350/TH400/Dana20
Early model with razor grill
Spring Green exterior (original)

Custom series interior
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Old 08-31-2021, 10:45 AM
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tgreese tgreese is offline
 
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Parts book.

Alphabetical listing.

Switch, Tail and Stop Lamp.

Group 3, 3.333-1

All 1972 and prior, 931216

RockAuto, PN lookup - https://www.rockauto.com/en/partsearch/?partnum=931216

It's hydraulic. All '72 and earlier are. The CJ guys use this part too, and it's very unreliable. You can convert it to a more modern push button on the brake pedal with a little effort. The switch may be located on a junction block, either by itself or with the brake warning switch. Follow the lines.

Looks like this https://www.ebay.com/itm/Painless-Pe...g/372173266249

You'd be much better off with the '72 or '73 manual than the '74. '74 was a watershed year for the Wagoneer, and lots changes. I would just pony up and buy the right manual - https://www.bjsoffroad.com/1965-1971...al_p_1055.html - might be available on RockAuto.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk

Last edited by tgreese : 08-31-2021 at 10:56 AM.
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Old 08-31-2021, 11:04 AM
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drcom drcom is offline
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Thank you !!!! I don't know what pizza you like but I would like to buy an extra large for you and the family.

The manual has been ordered !!!!






Quote:
Originally Posted by tgreese
Parts book.

Alphabetical listing.

Switch, Tail and Stop Lamp.

Group 3, 3.333-1

All 1972 and prior, 931216

RockAuto, PN lookup - https://www.rockauto.com/en/partsearch/?partnum=931216

It's hydraulic. All '72 and earlier are. The CJ guys use this part too, and it's very unreliable. You can convert it to a more modern push button on the brake pedal with a little effort. The switch may be located on a junction block, either by itself or with the brake warning switch. Follow the lines.

Looks like this https://www.ebay.com/itm/Painless-Pe...g/372173266249

You'd be much better off with the '72 or '73 manual than the '74. '74 was a watershed year for the Wagoneer, and lots changes. I would just pony up and buy the right manual - https://www.bjsoffroad.com/1965-1971...al_p_1055.html - might be available on RockAuto.
__________________
1970 Wagoneer Custom (9/1969)
Original Arizona Jeep
Buick 350/TH400/Dana20
Early model with razor grill
Spring Green exterior (original)

Custom series interior

Last edited by drcom : 08-31-2021 at 12:00 PM.
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Old 08-31-2021, 12:44 PM
oregonphil oregonphil is offline
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The switch on my '72 Commando is on the front end of the master cylinder, easy access.
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Old 08-31-2021, 02:36 PM
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Switch screws into bottom of master cylinder. Make sure to totally blast the crud out of the wiring harness connector. These are known to develop corrosion and result in poor electrical contact. The switch itself fills up with all the sludge that settles out of the master cylinder.
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Old 08-31-2021, 02:52 PM
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I saw a plug in the bottom of the master cylinder. I'll post a pic when I can.


Quote:
Originally Posted by Herk
Switch screws into bottom of master cylinder. Make sure to totally blast the crud out of the wiring harness connector. These are known to develop corrosion and result in poor electrical contact. The switch itself fills up with all the sludge that settles out of the master cylinder.
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1970 Wagoneer Custom (9/1969)
Original Arizona Jeep
Buick 350/TH400/Dana20
Early model with razor grill
Spring Green exterior (original)

Custom series interior

Last edited by drcom : 08-31-2021 at 04:37 PM.
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  #7  
Old 09-01-2021, 07:52 AM
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tgreese tgreese is offline
 
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I'm not convinced ... maybe. The switch could go into the master cylinder, or into the junction block where the brake light warning switch is.

The parts book shows that "plug" not as a plug but as a piston stop bolt. Group 8. It cannot function as a stop if you remove it and replace it with the sender.

I suggest you let the Jeep be its own reference. It seems very unlikely that the PO would have removed the switch and left the vehicle without any stop lights. Look at the brake lines and find the switch. Or search backwards from the brake lights, either from the column or from the lights, and find the connector.

Wait until you get the manual and trace out the wiring to the switch. Don't assume.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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  #8  
Old 09-01-2021, 03:01 PM
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Heep-J4000 Heep-J4000 is offline
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Don't know about all wagoneers , but some seventies j-trucks have the brake light switch on the brake pedal rod under the dash.
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  #9  
Old 09-01-2021, 04:29 PM
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drcom drcom is offline
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SOLVED

I found the wires. The switch goes under the master cylinder. I will upgrade it later AFTER the state inspection. Just want to get it working. I learned alot about this thing. I also ordered the manual for the 1970.



Yes, I ordered the correct plug for it.






]brake sensor wires
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1970 Wagoneer Custom (9/1969)
Original Arizona Jeep
Buick 350/TH400/Dana20
Early model with razor grill
Spring Green exterior (original)

Custom series interior
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  #10  
Old 09-03-2021, 12:19 PM
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drcom drcom is offline
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SUCCESS 9-3-21

Yes, I know it isn't very exciting for those folks that have replaced their original engine with the NASA rocket engine, but for this old timer, brake lights are pretty exciting. They now work. Thanks for all the help guys. Oh yeah, the plug from Autozone doesn't fut and is worthless. I made a temporary connection until I can move it inside to the brake pedal.


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1970 Wagoneer Custom (9/1969)
Original Arizona Jeep
Buick 350/TH400/Dana20
Early model with razor grill
Spring Green exterior (original)

Custom series interior
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