| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,108 Posts1,056,230 Members48,436 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | Anyone here ever used a Delco 10 SI alternator plug with a diode on your old truck alternator conversion? I am having a battery drain overnight and have narrowed it down to the spade plug on the alternator. When I unplugged from the spade terminal the battery held a complete charge overnight. Gone thru 4 alternators in the last year. First three were bad not charging , the present charging but battery drains overnight. have just replace d the bearing in my old one. | | | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | Where do you have the diode and the two terminals on the alternator connected? | | | | | Joined: Feb 2004 Posts: 29,803 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,803 | You have an excessive amount of current draw through the regulator assembly inside the alternator. Most of them are made offshore these days, and they're junk. Normally, it's only a few milliamps, and it would take weeks to drain the battery. Either install an original equipment Delco Remy regulator (NOT AC-Delco) or wire the excitation voltage through he ignition switch.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | The two terminals are connected on the top side at the 2:00 o clock position. I have nit installed a diode but read an article that stated the diode would act as a check valve to direct the current only one way and not allow a back draw and drain the battery after the ignition is off. | | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | Jerry do you have a diagram of the wiring schematic you described? | | | | | Joined: Jan 2014 Posts: 3,687 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,687 | Jerry do you have a diagram of the wiring schematic you described? If you just type “10 si wiring” into your favorite search engine….you will get several diagrams that illustrate what Jerry is describing.
1951 3100
| | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | | | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | Problem solved. I ordered a new alternator connection plug with the diode and installed it as Jerry described, I connected everthing and waited until the next morning and she started right up. Battery still had a full charge. Thanks Guys | | |
|
|
| |
