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Old 11-02-2008, 05:29 PM
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relay wiring

can i run my headlight and fan relays with the same Feed , Ground and Ignition Feed feed wire .i have a extra wire left for the cruise control i thought i could use that wire, don't make sense to run separate feeds for each one thanks.

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Old 11-02-2008, 06:06 PM
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If your talking about just powereing the relay coils that is fine.

Vince
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Old 11-02-2008, 08:01 PM
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If you're talking about the power to flow through the relays and run the headlights and fan(s), you should use separate, fused circuits. Btw, do you mean heater fan or radiator fan?
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Old 11-02-2008, 08:33 PM
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If you are trying to POWER the relays (meaning the main power feed not control), then the answer is no. Most time people need there Headlights and Fans at the same time. Other wise I can't imagine a time when you would use the same control circuit to energize the headlight relay and the Fan relay at the same time, every time.
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Old 11-02-2008, 09:38 PM
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Quote:
Originally Posted by yknot
Other wise I can't imagine a time when you would use the same control circuit to energize the headlight relay and the Fan relay at the same time, every time.
He would not be energizing the fan and headlamps at the same time, he is just using the circuit for realy coil power through switches....I hope .

Vince
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Old 11-02-2008, 09:58 PM
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In answer to your question, YES. You can use the same key-on power to each relay. Keep in mind the relay needs a second power lead, this must be a fused battery voltage wire, on at all times. The relays will each need a ground. Set up this way, your key on power will energize the relays, which in turn will send out maximum voltage to what you are powering up.

I do not try to remember each pin/wire connection, so I just use this link.
http://www.6066gmcguy.org/BoschRelay.htm
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Old 11-03-2008, 07:30 AM
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Here is another very good source on relays.

This is another

Vince
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Old 11-03-2008, 08:55 AM
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thanks for the input wiring is not my strong point. im installing my harness in my 48 chevy truck and i bought a relay kit for the electric fan ,but after all the reading i been doing i thought it might be a good idea to do the headlights also. i was just a little confused i guess my real question was did i just need to run one fused constant 12 volt source to power the relays or did i need three separate fused constant 12 volt (one to each relay separately) just trying to keep it clean and run as few wires as possible. also would it be 10ga wire with a 30 amp fuse. thanks again
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Old 11-03-2008, 11:57 AM
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I have the 'heavy duty' universal 'Bosch' relay pigtail connectors with 2 main 10 gauge wires.
One is on the '30', and the other is on '87'. The '85' and '86' are 16 gauge wire, and '87A' is 14 gauge wire.

30 is the 'fused' battery power.
87 is the power out.
85 or 86 are the "trigger" connections, you could run 1 16, or 14 gauge wire to both relays from keyed power, or switched ground, depending how you want to wire them.

Just follow the "wiring" schematic, of your choice from the links suggested above, and you will be just fine.

Personally, I like to run a ground trigger, when running a long length of wire through the fire wall, but with your wiring harness, it is OK to run a power trigger.

Stephen
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Old 11-03-2008, 01:21 PM
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Carsavvy & 302 Z28, great links, bookmarked.
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Old 11-03-2008, 06:27 PM
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Carsavvy & 302 Z28, great links, bookmarked.
Yer welcome, good luck with your project.

Vince
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Old 11-03-2008, 07:03 PM
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Originally Posted by speedydude
Carsavvy & 302 Z28, great links, bookmarked.
Your welcome. speedy
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