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Rear defrost switch

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Old 01-13-2010, 10:46 PM
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Rear defrost switch

I just got a switch for the rear defrost for a 91-94 Explorer,
Engineering Number F37B-19A328-AA
Part Number F3TZ18C621B
Supposed to be self contained with timer...just need power.
I plan on installing it in my F350 for mirror heat that I just installed.
It has 5 wires which means there is more to hook up than power in, out and ground.
Anyone have a schematic or the color codes for this?
How about rating for the switch? The mirrors only pull 1.4 amps total.

Here are the colors...

2 large (14g)
Brown w/ Lt blue stripe
Grey w/ lt blue stripe

3 small (18g)
Purple w/ Orange stripe
Lt Blue w/ Red stripe
Black ( I assume it's ground)

And Pics....







Thanks all!
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Old 01-14-2010, 06:45 AM
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Here's the circuit, have no idea in the switch rating but surely the mirror is less than the rear window grid.

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Old 01-14-2010, 07:53 AM
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It's hard to tell from the diagram above, but fuse 11 appears to be a 15-amp fuse so the switch should be good for at least that much current since there is probably a chance that the rear window defrost could be the only thing on that circuit that would be operational when the defrost circuit could short out, therefore all 15 amps could momentarily flow through the switch before the fuse would blow. Continuous current of the rear window defrost is probably in the neighborhood of 5 amps, you should have no problem using the switch for your mirrors.

-Rod
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Old 01-14-2010, 10:56 AM
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Wow! Thanks guys! That is exactly what I needed. Now to find the time to mount it....wire it....etc.
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Old 12-07-2015, 06:40 PM
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Part number for applicable wiring plug/harness

Quote:
Originally Posted by BillyBob69 View Post
I just got a switch for the rear defrost for a 91-94 Explorer,
Engineering Number F37B-19A328-AA
Part Number F3TZ18C621B
Supposed to be self contained with timer...just need power.
I plan on installing it in my F350 for mirror heat that I just installed.
It has 5 wires which means there is more to hook up than power in, out and ground.
Anyone have a schematic or the color codes for this?
How about rating for the switch? The mirrors only pull 1.4 amps total.

Here are the colors...

2 large (14g)
Brown w/ Lt blue stripe
Grey w/ lt blue stripe

3 small (18g)
Purple w/ Orange stripe
Lt Blue w/ Red stripe
Black ( I assume it's ground)

And Pics....







Thanks all!
Hi, I bought the switch but it didn't come with the wiring/plug. Would you happen to have a part number for that?
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Old 12-07-2015, 07:24 PM
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Quote:
Originally Posted by rstev39147 View Post
Hi, I bought the switch but it didn't come with the wiring/plug. Would you happen to have a part number for that?
I'm afraid I don't. I got lucky and mine came with it.
You can do searches like in Google or eBay for pigtails or..... Salvage yard or..... Just connect direct to the back of the switch. With the pics n diagram you should be able to see what goes where. At first I was thinking of connecting direct to the back of the switch until I saw the part with the pigtail.
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1997, 2003, 2007, blows, defrost, defroster, equivalent, explorer, f350, f37b19a328aa, f3tz18c621b, ford, fuse, fuses, rear, switch

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