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Ballast Resistor
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Mudd  



Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio

PostPosted: Tue Nov 20, 2012 9:37 am    Post subject: Ballast Resistor Reply with quote

Noticed yesterday that my Ballast Resistor above the radiator on my 1978 924 is rotten. First of all what does it do and where can I get one. The number on it is beru wz18-2f
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Paul  



Joined: 02 Nov 2002
Posts: 9438
Location: Southeast Wisconsin

PostPosted: Tue Nov 20, 2012 1:51 pm    Post subject: Reply with quote

It's used to run the radiator fan at slow speed when the ignition is off and the radiator is still hot.
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 913
Location: Maysville, Colorado

PostPosted: Tue Nov 20, 2012 11:26 pm    Post subject: Reply with quote

According to RC I believe it is a 5.2 ohm, 50 watt resistor. I found one somewhere, maybe Automotion for about $17, but bought a 5 ohm 50 watt from Allied Electronics for $5 also available on Ebay. bought a couple of extra, but am in Mexico for the winter so can't send you one. I mounted it to the front cross member. I had to drill out the non-solderable steel connections for some very small bolts, 1.5 or 2 mm.
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Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
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Mudd  



Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio

PostPosted: Wed Nov 21, 2012 5:54 am    Post subject: Reply with quote

I can not find these anywhere. I will try to remove it and soak it in vinager to clean it. If that does not work I geuss I'm screwed.
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Paul  



Joined: 02 Nov 2002
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PostPosted: Thu Nov 22, 2012 2:08 pm    Post subject: Reply with quote

You'll be fine without it in the cold months. Just insulate the wires ends until you can find one.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
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Mudd  



Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio

PostPosted: Thu Jan 31, 2013 12:51 pm    Post subject: Reply with quote

I am going to revive this post because I still have not located a ballast resistor for my 1978 924. I posted pictures of the car on pelican under the heading Pictures of my cars, and pictures of the part I am looking under the title What is this. Any help locating this part would be appreciated.
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ideola  



Joined: 01 Oct 2004
Posts: 15505
Location: Woodstock IL

PostPosted: Thu Jan 31, 2013 1:22 pm    Post subject: Reply with quote

There are two parts listed in the -79 PET. The first part is 477 905 053 (superseded to 477 905 053 A) both of which are NLA. The second part is 477 905 052 (superseded to 477 905 052 A). Both of the 052 parts are showing with prices listed in Porsche's inventory, which is usually a good sign that they're still available, but no guarantee.

Now, the tricky part is that the 052 part is good for chassis 92471-05387 onward...so you will need to check your VIN.

I believe that the 053 number is for the one that goes on the radiator, and the 052 number is for the later setup where they are screwed onto the firewall under the dashboard, but I'm not positive on this, and PET is not very instructive. I also do not know if the parts are interchangeable. Both parts are less than $26 according to my online catalog. Let me know if you want me to check into availability.

{EDIT}
Another clue is whether your car has A/C. The 052 part is designated as being for the M573 option, which is factory A/C.
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Paul  



Joined: 02 Nov 2002
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Location: Southeast Wisconsin

PostPosted: Thu Jan 31, 2013 1:31 pm    Post subject: Reply with quote

Part number 477 905 053A series resistor. Retail price at the dealer: $26.66
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
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Porsche: It's not driving, it's therapy.
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Mudd  



Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio

PostPosted: Thu Jan 31, 2013 1:32 pm    Post subject: Reply with quote

ideola you are a fountain of information. My car does have AC. Any help you can give me would be great. I am not sure what PET is.. So if the parts are not interchangeable I will have to find someone with a 1978 924 with AC that is parting the car out.
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Paul  



Joined: 02 Nov 2002
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PostPosted: Thu Jan 31, 2013 1:34 pm    Post subject: Reply with quote

PET is a parts list, available for free at http://www.porsche.com/usa/accessoriesandservices/porscheservice/originalparts/originalpartscatalogue/
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
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Paul  



Joined: 02 Nov 2002
Posts: 9438
Location: Southeast Wisconsin

PostPosted: Thu Jan 31, 2013 1:51 pm    Post subject: Reply with quote

Looks like Ideoli and I were typing at the same time. I show the 52A part number as $24.94 and is the one needed for the 573 option. My guess is either one will work, just have to mount and wire it.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.


Last edited by Paul on Thu Jan 31, 2013 1:53 pm; edited 1 time in total
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Mudd  



Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio

PostPosted: Thu Jan 31, 2013 1:53 pm    Post subject: Reply with quote

It looks the 053 is for non AC cars.

The VIN number is 9248208958
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Paul  



Joined: 02 Nov 2002
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PostPosted: Thu Jan 31, 2013 2:01 pm    Post subject: Reply with quote

Have you called a dealer at any point to try to buy this?
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.
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Mudd  



Joined: 27 Aug 2012
Posts: 78
Location: Cincinnati,Ohio

PostPosted: Fri Feb 01, 2013 12:58 am    Post subject: Reply with quote

Paul, I just noticed that you have owned and repaired 924s since 1977 ( The year I got out of the Air Force ). Have you ever had to deal with this resistor in the past.
Everything is pointing to the 052 resistor but I don't see the ohm value listed anyplace. I beleive mine has 1,8 stamped into it. I went down to the Electrical Engineers here at work and they are not sure what 1,8 refers to. I did get 15 minutes of how a fan is powered by a 12v battery and some other stuff made my mind glaze over.
So does the 1,8 pertain to the ohm value of the resistor.
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ideola  



Joined: 01 Oct 2004
Posts: 15505
Location: Woodstock IL

PostPosted: Fri Feb 01, 2013 1:36 am    Post subject: Reply with quote

If you look at your VIN, you will see that it falls after the range that I listed above. So according to both PET and Porsche's online dealer catalog, the 052 part is the correct one for your car, particularly since your car has A/C.

As noted above, the 052 part has been superseded to 052A. As noted above, both parts are showing up in Porsche's online dealer catalog, so it's possible (but not guaranteed) that you can get either part. I will check with my Porsche contact to verify availability and pricing.

Quote:
Have you called a dealer at any point to try to buy this?
Paul, Ideola's Garage is now a Porsche parts dealer I now have access to their entire online catalog and can view pricing and availability, although many of the older specialty items like this still require double checking.
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