Stereo on key off

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LittleBill

Copper - Posts: 72

Joined: May 16, 2003

Location: United States

Posted: May 16, 2003 at 2:29 PM / IP Logged

hi new the form love everything about it allready, i do have a question about the radio on key off diagram, these are using 5 post relays i only have 4 post relays i don't have 87a could someone tell me what that does, and one more question what stops the radio from coming back on after i shut the door? thanks for any help u may offer

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: May 16, 2003 at 4:39 PM / IP Logged

When the coil of an SPDT relay is at rest, or not energized, terminals 87a (normally closed) and 30 (common) have continuity.

Initially, when you turn on the key to the accessory position, the first relay becomes a latch and continues to supply 12V+ to the radio's accessory lead even after you turn the key to the off position. Once a door is opened with the key in the off position, the coil of the second relay is energized and ground is broken to the coil of the first relay (latch). Now the first relay no longer supplies 12V+ to the radio. Once this happens, the only way for the first relay to supply 12V+ to the radio again is by turning the key to the accesssory position again.

Stereo on key off -- posted image.

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LittleBill

Copper - Posts: 72

Joined: May 16, 2003

Location: United States

Posted: May 16, 2003 at 4:48 PM / IP Logged

do i have to use this diagram, i want it to power everything, u are showing the 3 relay one i was wondering if i could just use the 2 relay?

the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: May 16, 2003 at 5:03 PM / IP Logged

The third relay in my diagram is needed to prevent the radio, or whatever you have the set up powering, from turning off when you open a door with the key in the accessory and run positions.

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LittleBill

Copper - Posts: 72

Joined: May 16, 2003

Location: United States

Posted: May 16, 2003 at 6:48 PM / IP Logged

i understand that if i was using diodes to only turn on a specific thing, but i need it to power everything, once i turn the key to on or acc, the whole relay setup would get bypassed and the radio would get power regardless because u aren't cutting the wire, ur just splicing into it and adding an additional power source? correct me if im wrong, and my other question where are u getting 5 post relays, i have looked a couple places like radio shack they only have 4 post ones

LittleBill

Copper - Posts: 72

Joined: May 16, 2003

Location: United States

Posted: May 16, 2003 at 6:53 PM / IP Logged

actually i have to ask another question, if u want to cut power to everything but the radio couldn't u just put a diode before ur splice inline to the radio? that way power can't run backwards? through the accessory line? wouldn't that be all u need to do or am im completly missing something

the12volt

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Location: Louisiana, United States

Posted: May 16, 2003 at 8:11 PM / IP Logged

LittleBill wrote:

....once i turn the key to on or acc, the whole relay setup would get bypassed and the radio would get power regardless because u aren't cutting the wire, ur just splicing into it and adding an additional power source? correct me if im wrong, and my other question where are u getting 5 post relays, i have looked a couple places like radio shack they only have 4 post ones

Look at the diagram again, you are cutting the wire to the radio That's what the dashed line indicates. You can purchase SPDT (5 posts) relays from a local electronics shop or on line. You can also call Eagle Parts at 800-726-5930 Monday through Friday 8:00 AM - 5:00 PM CST.

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the12volt

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Location: Louisiana, United States

Posted: May 16, 2003 at 8:19 PM / IP Logged

LittleBill wrote:

Yes and no. You would have to use a diode with a rating high enough to safely pass the current draw of the radio without destroying the diode. If that is what you want to do, I'd still use relays and one amp diodes to power the radio while isolating it from anything else you want to run on the same lead, but my answer is limited and depends on what you mean by everything. If you describe exactly what it is you are trying to do, I'll do my best to describe what you'll need to do to accomplish it.

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LittleBill

Copper - Posts: 72

Joined: May 16, 2003

Location: United States

Posted: May 16, 2003 at 9:22 PM / IP Logged

ok lets see if i get my information correct then, for the diode, everything u pass through must be takin into account so if im pulling 10 amp through the line, i have to make sure the diode can handle 10 amps, it doesn't matter what its blocking just whats actually get passed through (ex. my radio)? did i understand that correctly, and for the part about cutting the wire, im not using that diagram im using the 2 relay setup which doesn't cut the accessory line, and what i mean by powering everything, i mean like my sunroof, im just going to splice into my radio constant and ground wires, i don't see enough power being drawn to blow the 10 amp fuse but i may be wrong, im going to go to curcit city tommorow, those guys probably have relays from the remote starters there

LittleBill

Copper - Posts: 72

Joined: May 16, 2003

Location: United States

Posted: May 17, 2003 at 2:30 PM / IP Logged

well i got my relay circuit does sell them but they are 12.99 13.77 with tax, this is high although it does come with the socket and 14 gauge wiring part number is 525t but if u just need the realy which is really all i needed its 610t, i will post my results later

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