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#1 |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Relay Question?
I'm putting an ignition kill switch in my truck (along with another switch on the NSS) but I've got a question about which relay to use.
For the ignition I don't want to use a Bosch style because if the switch accidentally turns off while I'm driving it will still kill the coil power, what kind of relay can I put in that would cut power when the switch is off but after the car is started (ignition on) would stay on even if the switch turns off? So say if I hit a bump and the switch malfunctions it would stay running and only turn off when I killed the engine (killing the engine would work like a reset button or something). I'm sure there is something like that out there but I don't know what it would be called to get it. Thanks Michael
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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#2 |
Registered User
Join Date: Jan 2007
Location: Sonoma, CA
Posts: 521
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Re: Relay Question?
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Oscar '72 Shortbed Fleetside '95 Jimmy 4X4 '69 GMC Custom Camper |
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#3 |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Re: Relay Question?
Thanks for the reply but that confused me a little....read through it but that's some pretty advanced stuff there.
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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#4 |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Relay Question?
The purpose of a relay is to allow a higher voltage or load to be switched and controlled by a low voltage low draw circuit. This protects switching components such as the headlight switch, electric fans, electric fuel pumps switches, etc. The ignition switch is designed to carry the low amperage draw of the ignition coil so why do you want to put a relay there. If you want to keep the engine running if the switch cuts off you could just put a hidden toggle switch in the coil feed wire and feed it from any hot source off the fuse panel, doing away with the ignition switch altogether as the ignition source.
Having more than the normal voltage to the coil may be necessary if the engine is to be revved more than 6000 RPMs as in drag racing or if you are feeding more than the normal amount of circuits off the ignition switch.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#5 | |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Re: Relay Question?
Quote:
So once the ignition and toggle are on it gets power but if the toggle goes off (once it has power) it will continue to have power until the ignition is cut.
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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#6 | |
Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: Relay Question?
If you want to latch the relay just jump terminal 87 to 86 that way the relay will energize itself regardless of the state of the kill switch and once the ignition is turned off the relay shuts down.
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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#7 | |
Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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Re: Relay Question?
Quote:
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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Tags |
bosch, ignition, kill, relay, switch |
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