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6V Relay on 12V System


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Cali_pilot 
Copper - Posts: 73
Copper spacespace
Joined: April 11, 2005
Location: Virginia, United States
Posted: May 07, 2018 at 11:03 PM / IP Logged Link to Post Post Reply Quote Cali_pilot
I have 6.4 vdc from my OEM Ford stereo to trigger on my DSP. My DSP will power up when the remote turn on sees the 6.4v but it's hit or miss. It is sensitive to ambient temps. For example, the low voltage will not power it on in the early morning for my drive into work but by noon it's working fine. I can easily tap into a nearby 12v switched source but I'd like to use the 6.4v to keep a feature available. I have a Tyco 6v spdt relay that I'm trying to use to provide a 12v output to my DSP but the 6.4v I'm giving it is not energizing the coil. Giving it 12v energized it just fine. Long story short, I'm trying to figure out if I can power this relay with +6.4v on pin 86 and -12v(???) on pin 85? I didn't think the ground really mattered but I honestly don't know. I'm thinking I probably received a 12v relay mislabeled as 6v.
2011 Ford F-150 Super-Crew FX4
HU: Pioneer AVIC-Z1
Fronts: Infinity Kappa 682.9cf
Rears: Infinity Kappa 682.9cf
Amp: Profile AP1040
Sub: Pioneer TS-SWX251
geepherder 
Platinum - Posts: 3,584
Platinum spaceThis member consistently provides reliable informationspace
Joined: October 27, 2003
Posted: May 08, 2018 at 7:07 AM / IP Logged Link to Post Post Reply Quote geepherder
Your 6v relay should trigger, however, you could just use an NPN transistor to trigger a relay. Base to your factory Ford turn on, collector to fused 12v, emitter to one side of the relay's coil (ground the other side of the coil). Terminal 30 to 12v, 87 to your DSP turn on.
My ex once told me I have a perfect face for radio.
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: May 08, 2018 at 8:12 PM / IP Logged Link to Post Post Reply Quote eguru
geepherder wrote:
Your 6v relay should trigger, however, you could just use an NPN transistor to trigger a relay. Base to your factory Ford turn on, collector to fused 12v, emitter to one side of the relay's coil (ground the other side of the coil). Terminal 30 to 12v, 87 to your DSP turn on.
An N-channel FET connected on the ground side of the relay coil (other terminal connected to 12V) would be a more robust solution.

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