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Old 02-17-2015, 10:14 AM   #1
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1978 23' Safari
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License plate bulb for 1978 Safari

I'm confused about the license plate bulb that is required for my 1978 Safari. The original holder is the chrome Yankee 331/332 model. The socket is a dual contact type. Yet when I look in my original owners manual, it calls for a #89 bulb, which is a single contact bulb. I removed the holder and it does have two wires running to the holder. I'm assuming the ground is acchived when you mount the holder to the trailer. Why would a license holder require a dual contact bulb?
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Old 02-28-2015, 12:42 PM   #2
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never seen that

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Originally Posted by eb4tx View Post
I'm confused about the license plate bulb that is required for my 1978 Safari. The original holder is the chrome Yankee 331/332 model. The socket is a dual contact type. Yet when I look in my original owners manual, it calls for a #89 bulb, which is a single contact bulb. I removed the holder and it does have two wires running to the holder. I'm assuming the ground is acchived when you mount the holder to the trailer. Why would a license holder require a dual contact bulb?
I have never seen a double contact in that light which is made by Truck-lite. My guess would be that it has to do with a grounding issue. Airstream may have need to do it that way to make sure it worked every time and all the time. Are the two barbs on the side the same distance to the bottom or are they off-set? In other words is it like an 1157 style or an 1142 style socket?

It may be that you can change the whole fixture so you can replace the bulbs (as needed) with something that is easy to find.
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Old 02-28-2015, 04:38 PM   #3
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If the base of the bulb is the same size as an 1157. The bulb you want is NAPA #BP1004.
It is a single filament bulb with 2 contacts.
The bulb itself is smaller than an 1157 but the base is the same as an 1157.
Hope this helps.
If you can't find any. I have 2 that I have no use for. Send me your address and I will send them to you.


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Old 03-01-2015, 07:44 AM   #4
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1978 23' Safari
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Thanks for your input. After much research, I have seen other posts with mid-70's Airstreams where others had same dilemma. So not unique to my trailer. I found that a #90 bulb is required. A #90 bulb is same size as a #89, BUT, with a single filament/dual contact. One contact is ground (gray wire) other contact is positive (red wire).
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