stevep516 Posted June 5, 2020 Share Posted June 5, 2020 I'm looking for a replacement source for the current limiter relay for our 29 Buick. I'm also interested to hear if anyone has rewired a car and replaced the relay with a conventional fuse block. Thanks, Link to comment Share on other sites More sharing options...
raydurr Posted June 5, 2020 Share Posted June 5, 2020 Steve the current limiting relay is a fairly difficult piece to find. Do you not have one at all? If you do it can usually be reconditioned ,if they aren't in too bad of shape. Relays from other vehicles besides the 1929 can sometimes be used. Link to comment Share on other sites More sharing options...
Str8-8-Dave Posted June 5, 2020 Share Posted June 5, 2020 (edited) Steve- If you do have a relay you would do well to post a picture as several styles were used over the years. It could be the one you are looking for is common to 30 and 31 models. My car is a 31 and had no relay and I took one from a 30 as they are identical. Edited June 5, 2020 by Str8-8-Dave (see edit history) Link to comment Share on other sites More sharing options...
Mark Shaw Posted June 5, 2020 Share Posted June 5, 2020 Many years ago, a previous owner replaced that relay in my 29-27 with a single fuse... I may be wrong, but I think it was a 20 amp fuse. It is now my son's car. Link to comment Share on other sites More sharing options...
stevep516 Posted June 5, 2020 Author Share Posted June 5, 2020 Sorry guys, This is the car that has been sitting since 1954. It runs great, so I'm in the process of re-wiring the car. Unfortunately, the previous owner removed all of the wiring including the relay. I'm n ot sure what happened to it so, I'm looking for one I can use or maybe mount a fuse under the dash. As always , Thanks Link to comment Share on other sites More sharing options...
Bill - 29 Buick Posted June 5, 2020 Share Posted June 5, 2020 Steve: Here is what a 29-25 owner did in Finland. <https://www.29buickphotos.com/Information/29-25-Restoring-after-55-years/i-Lcf6vCB/A> He used fuses and put them on a board with a hinge so it folds up, out of site, under the dash. Send me your email and I'll send you some places you may be able to get a Current Limit relay. Bill McLaughlin 1929 Silver Anniversary Buick Club Bill at 29Buick.ca Link to comment Share on other sites More sharing options...
stevep516 Posted June 5, 2020 Author Share Posted June 5, 2020 Thank you Bill, I appreciate the help! Regards, sapuckette at g mail dot com Link to comment Share on other sites More sharing options...
jps Posted June 6, 2020 Share Posted June 6, 2020 Steve, I just re-wired my 29-27 sedan and I bought a refurbished current relay from Old Schoolhouse Restorations (Tony Bult) in Whitewater, WI. He should have one available because I sent my old one back to him so that he could refurbish it for some future customer. My old one was functionally OK, it just was rusty. Tony has a lot of parts for 1927-1930 Buicks. It states in the 1929 Service Manual that the current at which the relay activates is between 30 and 35 Amps. Personally, I think the relay vibrating is better than using a fuse for a couple reasons. First, you get an audible warning that there is a problem. Second, if the overload (short circuit) is corrected, the relay stops vibrating and you don't have to replace a blown fuse. Third, the 30-35A trip point on the relay is going to be more consistent than any thermal automotive fuse. The actual trip point for a thermal fuse is very temperature dependent, and they usually are rated to blow in amp-seconds, so if you use one rated at 20A it might need to see 20A for several seconds or minutes before it actually blows open. Finally, the relay limits the overload current to 30 or 35A, while a fuse will not limit the current at all. Limiting the current is much more friendly to your battery and generator. John Link to comment Share on other sites More sharing options...
stevep516 Posted June 10, 2020 Author Share Posted June 10, 2020 John, Thank you for your response........After listening to all, I've reached out to Tony and I'll be going back with the relay in the harness. As always, I appreciate everyone's time and input! Regards, 1 Link to comment Share on other sites More sharing options...
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