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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Nov 2004 Posts: 338 'Bolter | | 'Bolter Joined: Nov 2004 Posts: 338 | I'm converting to an alternator. I have several spare alternators bit I don't know if they have internal voltage regulators.
Is there any way of determining if there is an internal regulator? | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | InMy40's
SI, or internally regulated alternators will have the tabs for the DA plug on the circumference of the case and the tab orientation will look like this --. The case is usually embossed with 1 & 2.
The older style that would require a voltage regulator have the DA port on the BACK of the case..its pin configuration looks like this II. The case is usually embossed with R & F
Modern units have a small plug and maybe other differences, but they probably aren't what you are dealing with.
Stuart
Last edited by atomarc; 11/17/2007 6:02 AM.
| | | | | Joined: May 2003 Posts: 1,271 Shop Shark | | Shop Shark Joined: May 2003 Posts: 1,271 | The best of them all, in my opinion, is the Delco 12si -- with a Delco internal regulator!
The Delco internal regulator actually reads the temperature of your battery ... and when it's hot, like on a hot August day, the Delco internal regulator reacts to that and sends less voltage to your battery, extending battery-life significantly.
~~ Alan Horvath 1954 Chevy PickupSinging his praises in thePassing Lane | | | | | Joined: Nov 2004 Posts: 338 'Bolter | | 'Bolter Joined: Nov 2004 Posts: 338 | Thanks Stuart, it does have the regulator.
Alan, that's really interesting about the 12si. How does it read the temp on the battery? | | | | | Joined: May 2003 Posts: 1,271 Shop Shark | | Shop Shark Joined: May 2003 Posts: 1,271 | I don't know how it does it ... but I do know it's *only* the Delco internal regulator that does it. It also helps that I have my alternator wired correctly! Most people take the #2 wire and piggy-back it to the BAT connection -- that's the wire that reads how much voltage your system is getting from the battery. But doing it that way is just reading the battery itself. I've wired mine to a terminal on my firewall where all my equipment it getting juice from the battery -- see this picture: http://alanhorvath.com/54chevy/chevypics/wiring_1.jpgI installed the Delco 12si with a Delco internal regulator via advice from Mark at MadElectrical.com ... after noticing that my voltage gauge was dropping down to 11 Volts, from 14 volts, I called him and he asked me if it was a hot day. I said, yes ... and he said "That's great, Alan! That means you have the Delco internal regulator!" Then he explained it to me and I was amazed because I had never heard anyone talk about that before. It sure is a smart feature.
Last edited by Alan Horvath; 11/18/2007 4:12 AM.
~~ Alan Horvath 1954 Chevy PickupSinging his praises in thePassing Lane | | |
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