Re: Hydraulic stop light switch
Posted by HH56 On 2019/6/23 18:45:05
The brass block is at the end of the master under the steering column and I believe the brake light switch might be on the end although some cars has it screwed in one of the ports on the side of the block. It is fairly confined spaces but you might be able to see or reach from the top if you bend way over the fender. Switch is a hexagonal shaped unit about an inch in diameter with 2 terminals sticking out the end. Wires have a terminal on their ends which push over those on the switch. There should be an orange and a green wire on the terminals.
I don't remember if the body loom to the trunk goes overhead on 54s or if they moved it to the floor like they did for 55-6 models. The body loom is fairly thin with 5 or 6 wires in it. The schematics do not show any connecting plugs on the body loom except an inline connector which has 2 or 3 wires on each side but you might look under the dash or in the L kickpanel area for another round plug like the one at the edge of the dash connecting to wires coming out of the steering column.
The fact brakes and fuel and temp gauges are not working almost sounds like a power or circuit breaker problem except I believe there are two separately powered breakers involved so not likely a problem with both of them. The instruments have a voltage regulator at the center back of the cluster which is connected to a 10 amp breaker powered by the key. The regulator might have lost power or failed which would affect both gauges. You could check with a voltmeter connected to ground and see if there is 6v on the terminal in the center of the regulator and then see if there is anything coming out the terminal on the side. The regulator needs to be fastened to the cluster and grounded to work properly.
Brakes should be powered all the time via the other breaker but it is possible one of the wires was pulled off when the fellow was adding fluid. That same breaker does power the body feed line which the trunk light gets its power from. Does your back seat reading or courtesy light work when switched on or door opened? It gets power from the same place. The fuel sender wire is in the same bunch of wires and part of the body loom but is a wire straight from the tank to the fuel gauge.
Here is the diagram showing the back of the cluster and where to check voltage. The other is a typical 51-4 brake unit showing where the brass block and switch will be.
Attach file:
(185.57 KB)
(89.98 KB)
I don't remember if the body loom to the trunk goes overhead on 54s or if they moved it to the floor like they did for 55-6 models. The body loom is fairly thin with 5 or 6 wires in it. The schematics do not show any connecting plugs on the body loom except an inline connector which has 2 or 3 wires on each side but you might look under the dash or in the L kickpanel area for another round plug like the one at the edge of the dash connecting to wires coming out of the steering column.
The fact brakes and fuel and temp gauges are not working almost sounds like a power or circuit breaker problem except I believe there are two separately powered breakers involved so not likely a problem with both of them. The instruments have a voltage regulator at the center back of the cluster which is connected to a 10 amp breaker powered by the key. The regulator might have lost power or failed which would affect both gauges. You could check with a voltmeter connected to ground and see if there is 6v on the terminal in the center of the regulator and then see if there is anything coming out the terminal on the side. The regulator needs to be fastened to the cluster and grounded to work properly.
Brakes should be powered all the time via the other breaker but it is possible one of the wires was pulled off when the fellow was adding fluid. That same breaker does power the body feed line which the trunk light gets its power from. Does your back seat reading or courtesy light work when switched on or door opened? It gets power from the same place. The fuel sender wire is in the same bunch of wires and part of the body loom but is a wire straight from the tank to the fuel gauge.
Here is the diagram showing the back of the cluster and where to check voltage. The other is a typical 51-4 brake unit showing where the brass block and switch will be.
Attach file:
(185.57 KB)
(89.98 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=212815