The best hydrogen kits on the market have a relay. A good kit should have a HHO relay with instructions oh how to wire it to the engine. It is a vital part in the HHO kit that connects to your vehicle, engine and hydrogen system. Always consider a HHO relay as a means to isolate your HHO generator kit if current draw or amperage is a concern.
When you hook up an HHO generator kit the relay should help protect from too much current draw but a HHO pwm is also a vital part to consider along with a relay. A good set of plans will usually include a relay or HHO pwm when showing you how to build a HHO generator kit.
 HHO Relay 70 AMP 12V Hydrogen Generator Heavy Duty US $12.00 |
 COMPLETE HHO Hydrogen Premium Wire Harness Relay Kit US $31.10 |
 30 Amp PWM w Safety Relay for HHO Hydrogen Generator US $30.00 |
 25pcs 12V 70A 70amp Auto Relay good for HHO generator US $85.00 |
 10pcs 12V 70A 70amp Auto Relay good for HHO generator US $40.00 |
 12v dc Relay 4 wire Harness w Diode Auto or HHO US $7.99 |
 hydrogen generator HHO vehicle car 30 40 amp relay US $6.99 |
 HHO Water4Gas Hydrogen 12V 40 30 Amp Relay with Socket US $6.99 |
 HHO 40 amp Relay 40a NO 30 amp NC With Socket Harness US $5.99 |
