The Stovebolt Site Forums The Shop Area The Electrical Bay AD voltage regulators

I have a '48 Chevy half-ton. According to the 1929-1949 Master Parts Catalog, the part number should be 1118201 (fits 40-48, all Chevy vehicles). The regulator for 1949, and I assume later, too, calls for a 1118301. Can the 301 be used on a '48? If not, what is the significant difference between them?

I see that Jim Carter lists a regulator that fits the years 1940-1955. How can this be?

Tom,

Those two regulators are 'almost' identical. Both are 36 amp units, and the only difference is in some of the gap settings for the voltage and current regulators located inside...things that under normal circumstances wouldn't be fooled with.

The voltage setting and current setting on both are identical.

Stuart

Prolly the Jim Carter ad should say 1940 - 1954 as I think the change to 12 volts happened on the '55 1st series.

'55 1st was six volt, '55 2nd was 12 volt. It seems most catalogs list through '54 when they actually mean through '55 1st.

For those few things that are '55 1st specific that's a little frustrating.

Thanks for all the good information, guys. I'll install the 1118301.

Well, the 1118301 was bad, too, so I'm looking on ebay for another one. I see many that purport to fit all chevies from 40-52, 3, 4, but there are MANY Delco Remy part numbers supposedly fitting this description . Right now there are two vendors selling remanufactured regulators with part numbers 1118729. Can anyone tell me if these would be correct for my truck?

I'm not an expert by any means but it seems to me that if the parameters of a regulator (correct voltage & current capabilities) are compatible then a regulator is a regulator is a regulator.......

Tom,

I agree with Tiny. Although this is little help, the last number my books lists for a 6 volt, negative ground is a 1118725. The next number shown is a 1118730 which is a 6 volt positive ground regulator...no numbers in between, sorry.

Stuart

Tom,
If your just looking for a good quality replacement regulator I have those, only difference in apperance is it wont say Delco Remy on the top of the reg., however, if you have a delco reg. cap you can install it on the new replacement reg. or I can do one for you if you want that apperance. I may even have a NOS reg. for that truck but wont know until I get back to the shop. You can contact me at classicgenerator.com if you like.
Thanks
Ken
Classic Generator

Try cleaning up the points on those old ones. Get a real fine point file & file them lightly, then take a dollar bill & rub it over them like a shoeshine rag. Then try em again. That often will fix them. After you get it working get a voltmeter & put it across the battery. With the battery charged up good it should charge at 7-7 1/2 volts. It will be slightly higher with the cover off. Are you shure the gen is o.k.