This is a? picture of the bottom of a Bosch relay. These we can use in hooking up our Hydrogen electrolysers and efie to our vehicle.
You can find these at your local autoparts dealers.
Look at the markings (85, 86, 87, 87a, & 30) near the terminals. The terminals we will mostly use are 30, 85, 86, 87 for our hookups.
Always use a fuse before inline to the relay.
How the Bosch relay Works:
The following shows what those terminals are connected to on the inside of the relay. When there is no voltage
across terminals 85 and 86 (the coil), the relay’s movable contact (connected to terminal 30) is held, by spring tension, against the electrical contact which is connected to terminal 87a (the normally closed contact). In other words, when no voltage is applied to the relay coil, terminal 87a is connected to terminal 30. When 12 volts is applied to the relay coil (terminals 85 and 86), the movable contact (connected to terminal 30) is pulled in by the coil so that it contacts the electrical point that is connected to terminal 87. So if battery voltage is applied to the relay coil (terminals 85 and 86) terminal 30 will be connected to terminal 87.
Have I confused you yet? 
Some information from other sources and has been added here for convenience of our readers.
Related posts:
- Terminology of HHO Booster Cells and Sensors
- Build Your Own EFIE
- Spacing of Plates in Homemade HHO Cells
- About Fuel Cells
- How a Homemade Hydrogen Cell works
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Posted under Homemade Cell
This post was written by Michael on November 13, 2008
