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Old 10-11-2009, 06:17 PM
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Need HELP...courtesy lights

Being a total wiring moron, I can't get the courtesy light circuit working.

I'm using Ford (2 conductor) door switches and single wire bulb assemblies (the case prongs ground to the dash).

I wired the (+) side to the fuse-block, to the door switch, to the driver bulb, to the passenger door switch, to the passenger bulb.

I wired the (-) side to chassis, to the driver switch, to the passenger switch.

When I put 12v to the circuit I blow the bulbs.

I'm a total idiot, I can't do this (simple?) circuit.
Any help would be appreciated.

Thanks,
Bob

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Old 10-11-2009, 07:19 PM
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Hot should go only to the bulb. Then from the bulb, thru the switch to ground. 1 hot wire in and the negative side of the bulb holder out to the grounded switch= light.
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Old 10-11-2009, 07:36 PM
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Bob,

I am running 1 hot lead from source to (d)switch to (d)bulb to (p)switch to (p)bulb.
The negative is from the chassis to (d)switch to (p)switch.

Thanks,
Bob


Ps:bulb holder is self-grounding.
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Old 10-11-2009, 07:55 PM
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This may be a stupid question, but is the power wire going to the center wire in the bulb reciprocal?

What bulb number are you using? It may not be handling the amp draw.
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Old 10-11-2009, 08:30 PM
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Quote:
Originally Posted by AngliaBob
When I put 12v to the circuit I blow the bulbs.
Bob,

If you are blowing bulbs, it must be because you are using 6 volt bulbs instead of 12 V bulbs. If you are blowing FUSES, it is because there is a short circuit - as in power flows through the switches directly to ground, without having to go through the bulbs.

Typically, the courtesy lights are not wired independently of each other. They should both come on regardless of which door is opened.

It is common in older Ford products to switch the positive side of the courtesy light circuit. Most, if not all GM courtesy light circuits are wired differently.

From what I understand, based on the components you have described, I would wire them as follows:



One important note: If you are using a GM style headlight switch (like the ones that come in all the universal wiring kits), you cannot connect it to this circuit without either using a relay or changing the bulbs, sockets, and the way it is wired.

Hope this helps...

Joe G.

Last edited by Joe G; 10-11-2009 at 08:40 PM.
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Old 10-12-2009, 11:33 AM
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Just to add a little to Joe G.'s explanation.

Many standard door switches are designed to be screwed into the grounded door frame. When the door is opened, the spring loaded pin moves out and connects the single wire to ground through the door frame.

The other side of the courtesy bulbs are connected to constant 12 volts power, so when the path to ground is completed through the door pin switch, the lights come on.

If your Ford is designed to use the opposite wiring scheme, which would be switching the 12 volts on and off, then you will certainly blow fuses if you connect that wire to a grounded door switch.

Bruce
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Old 10-12-2009, 02:42 PM
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All...thank you very much...

Joe G...You are the man...Hooked it up like your diagram and it works perfect...

Thanks again everyone
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