Saginaw 4 speed .Near one of the lever/rod connections there is an backup Switch installed. The switch has 2 electric connections where a 2 el.cable should be mounted.Does some of you guys know what the function is of the backup switch and where to connect it? The attached pictures show the switch on the left side cover behind the lever. Martinius.
Not sure what year tranny yours is, but mine did not have this, perhaps mine is a older tranny. Flashlight
I'm no Saginaw (or any other kind of transmission) expert, but the switch should have +12 (or +6 if you have a 6 volt system) on one connector (either one, not important) available any time the key is on. The other connector has a wire that connects to what we in the US call "backup lights". The lights come on when you shift into reverse illuminating the area behind your car (truck) at night.
What Bill Said Just remember to use a 5 ampere fuse ! . If you put some driving lights under the bed a little bit , you'll have really bright backup lighting and the lip of the bed prevents blinding others behind you by cutting off the beam & making it flat and on the ground where it belongs... If you go this route , use a Hella/Bosch cube relay to take the load off the switch .
Wiring diagram backup lights ? Its a good idea to mount the driving lights under the bed. Nate, Could you be kind to draw a diagram . What i have is a 12v system with neg.ground. The Bosh/Hella cube relay how does it look like ? Martinius.
THANX Bill ! Martinus ; See the little picture in the upper right corner ? these " cube " relays are used on most all European cars from 1968 on , old VW Beetles have 50 A. ones under the rear seat on the left side ... They can be used for starter kickers , fog / driving and backup lights , additional horns , electric fans , on and on.... They're marked next to the prongs with the circuit #'s , # 30 is always the battery feed . # 15 is the switched ignition feed , so on and so forth . many have built in ATO typ (flat) fuses .
This whas exactly what i needed. Thank you guys for the good help Nate and Bill. This is exactly what i need. Sinc. Martinius.
It is called a spdt relay....single pole double throw. All terminals are marked. All a relay is is a magnetic switch. They can be used for lots of things, most commonly to send 12v straight to the accessory, instead of all the current going through a switch. 85 and 86 poles are your switch. 12v from the dash switch to one and ground to the other, doesn't matter which one. When you flip the switch, a magnet pulls the circuit inside. 30 is input. whatever is on 30 will come out at 87a when the relay is triggered. 12v to 30 in most set ups. 87 is relay at rest. most don't hook anything to this. If you are wiring an interrupt circuit ( like my flamethrowers), this is the output, which will be broken when triggered. 87a is output when triggered. Whatever you hook up to 30 will come out here. A shortcut in hooking it up is to run 12v to 30 and jump to 86. Wire from 85 through your switch then to ground. This way you don't have to run an extra power wire.
As usual .... Russ is right. A better circuit would be to put the backup light switch between the relay coil and ground. Two reasons. 1. You only have to run one wire to the transmission switch. 2. If that wire were to short to ground the only thing bad that would happen is your backup lights would come on when you didn't expect them to. In my previous schematic if either of the two wires connected to the transmission switch shorted to ground the fuse would blow. Here is the new schematic:
O.k. , As long as you're getting into the esoteric end of it , these relays , when used on fog or driving lights , can (should) be wired into the opposing light's circuit so the fog lights only come on with the low beams , conversely the driving lights only come on with the high beams . This is easily done by running the ground side of the relay through the opposing circuit .
