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Terrible One
08-07-2005, 10:50 PM
What case style is the alternator on my '76 ElDorado?

GM 10si or GM 10DN?

Thanks
KadillacKid
08-08-2005, 04:05 AM
On a 76 it should be a internal regulator 10SI model.....10DN have a external voltage regulator..... go to Google and type in '10SI alternator' for some pics!!! Good Luck
Terrible One
08-08-2005, 07:18 AM
Ah I see. Definitly 10SI. Thanks!
k10caddy
08-11-2005, 09:46 AM
is it still considered a 10si for the large case version (100 amp)?
76Eldo_convertFI
08-11-2005, 11:12 AM
is it still considered a 10si for the large case version (100 amp)?

Yep, 12si didn't show up until around 1983. http://www.madelectrical.com/electricaltech/delcoremy.shtml

However, I recently installed a 100 amp into my 76' Eldo. I bought it at CarQuest and asked for a 1981 Eldorado 100 amp (Delco 321136).

Been working fine for Mr. Eldo & his FI & Vegas AC load.
CadillacPat
08-11-2005, 02:58 PM
76Eldo_convertFI,
'81 up V8-6-4 Caddy's (I have owned two) came with 12SI (series integrated) alternators in both 80 and 100 amp versions. '82 up HT4100's also have them (I have owned at least six of these). My '80 Coupe with a carbureted 368 had the 10SI. My '81 Coupe with a Buick 4.1 V-6 had something small, but I know it wasn't a 12SI.
CadillacPat
08-11-2005, 02:58 PM
76Eldo_convertFI,
'81 up V8-6-4 Caddy's (I have owned two) came with 12SI (series integrated) alternators in both 80 and 100 amp versions. '82 up HT4100's also have them (I have owned at least six of these). My '80 Coupe with a carbureted 368 had the 10SI. My '81 Coupe with a Buick 4.1 V-6 had something small, but I know it wasn't a 12SI.
STDog
08-12-2005, 08:06 AM
Yep, 12si didn't show up until around 1983. http://www.madelectrical.com/electricaltech/delcoremy.shtml


Great link. You wouldn't know of one for alts with external regulators?

I don't like the location of the terminals on my alt and would like to find a 100 amp with the terminals in different spots. ('70 coupe).
CadillacPat
08-13-2005, 12:57 PM
STDog,
Most GM alternators can be "rotated" to obtain different "clock" positions.
"Clock" position refers to the position of the battery/regulator connection position with reference to the hour hand of a clock with the alternator mounts in a vertical axis (the top mount up and the bottom mount down). The front and back halves of the alternator case can be assembled in any of four positions. Usually, you can remove the case screws and SLIGHTLY split the case enough to rotate the back to the desired position. IF you split the case too far, you will unseat the brushes from the slip rings on the rotor. If this happens, you will have to completely split the case to insert something to hold the brushes (a straightened paper clip inserted in the hole in the back of the case behind the brush holder and through the holes provided in the brush holder works great). You push the straightened paper clip through while holding the brushes in far enough to allow it to hold both brushes and through all three bush holder holes. Then, you assemble the case and pull the paper clip out. You should hear two light clicks as the paper clip clears the brushes and they contact the rotor slip rings.