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09-05-2017, 09:16 PM | #1 |
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Alternator with internal regulator
I'm assuming this alternator has an internal regulator, but it's not listed on oreilly as having one.
https://www.oreillyauto.com/detail/b...rwd?q=V111621A It looks the same as this one that is listed as having an internal regulator. I had a new dead battery, and I just used the LMC plug to bypass the external regulator. Hoping to check the basics before looking for loose ground wires and drains. Battery died in about two days. https://www.oreillyauto.com/detail/u...kup-rwd?q=Alte Last edited by Bisblue; 09-05-2017 at 09:49 PM. |
09-05-2017, 09:56 PM | #2 |
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Re: Alternator with internal regulator
Yes, the alternator in the O'Reilly link appears to be an internally regulated Delco 10SI.
If it's charging okay but draining the battery when the engine isn't running, check to make sure the 2 wires that plug into the alternator aren't accidentally swapped. If you unplug the connector and measure the voltage on the two wires, the wire that goes to terminal #1 should only have power with the key on while the wire going to terminal #2 should be live all the time. The terminal identification markings (#1 & #2) should be cast into the alternator case. |
09-06-2017, 12:41 AM | #3 |
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Re: Alternator with internal regulator
Thanks ray
Will do |
09-07-2017, 09:12 PM | #4 |
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Re: Alternator with internal regulator
I figured a picture is worth a thousand words.
#1 seems to be drawing 8.5 volts constant after 10 minutes of sitting with the key off(????) (white wire from external regulator) #2 seems to be drawing 11.9 volts constant (blue wire from external regulator) the other red wire is also 11.9 volts constant (red wire from external regulator. |
09-07-2017, 09:29 PM | #5 |
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Re: Alternator with internal regulator
The 11.9 V readings on both the #2 and BAT stud red wire are okay. Although they should be up closer to 12.6 V for a fully charged battery.
The 8.5 V reading on the wire going to the #1 terminal is a concern though. That was measured on the white wire with the connector unplugged from the alternator, correct? Could you also post a pic showing how the wires are connected where the old external regulator used to be? |
09-07-2017, 10:55 PM | #6 |
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Re: Alternator with internal regulator
The readings were taken from the harness while connected to the alternator, both at the alternator, and where the wires go into the LMC external regulator adapter plug.
When I pulled the white alternator plug I got 0 volts on both wires. |
09-08-2017, 12:36 AM | #7 |
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Re: Alternator with internal regulator
You should forget the external regulator plug and run the red wire from it directly to the no,2 on the alternator and run the brown wire next to it directly to the no. 1 terminal on the alternator.
If you unplug the alternator plug and measure the volts on the white wire (no. 1) you should get zero volts key off and 12 volts key on. The brown wire at the regulator plug is where you should get 12 volts key on and zero key off. Then it is jumpered to the alternator no.1 via the white wire in the regulator plug to the no.1 at the alternator plug (white wire). The red wire is 12 volts constant at the regulator plug and at the alternator plug no.2 via the blue/red wire. The reason you got 8.2 was because you measured it plugged in and there is a 10 ohm resistance in the brown/white wire from the key switch. So your readings are where they should be. That appears to be one of those jumpers for the regulator plug and it seems to be working, so you might as well keep it. Here is what it does. here is how I do it.
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09-09-2017, 12:59 PM | #8 |
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Re: Alternator with internal regulator
So do I not need a ground wire as shown in your first attachment VetteVet?
It's definitely appears to have a battery drain, it was 11.45 this morning after charging it a 24 hours ago and driving it roughly 40 minutes. Gotta start pulling fuses I'm guessing and see if I can find a constant drain. Thanks again for all the help fellas |
09-09-2017, 01:55 PM | #9 |
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Re: Alternator with internal regulator
The SI alternators ground through the case to the engine block so the internal regulator is automatically grounded. The old style regulators had to be grounded to the sheet metal and to the alternator bodies in order for the points inside the regulator to work. While it won't hurt anything to have the ground, it isn't necessary.
You do know how to set up the drain check where you disconnect the negative battery cable and connect a test light or multimeter between the battery terminal and the negative cable? If you have a light, or read more than .004/4 milliamps. you have a drain. You want to check all the key off stuff first, so disconnect the alternator, the horn relay, look for any lights on. Stereo amp or radio etc. Don't forget that older batteries can go bad internally
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
09-09-2017, 02:39 PM | #10 |
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Re: Alternator with internal regulator
I have run a drain test on other vehicles, but thanks for the advice.
The battery is brand new and I had them test it as well. |
09-09-2017, 10:17 PM | #11 | |
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Re: Alternator with internal regulator
Quote:
The correct voltage at the alternator plug is 12 and 12 with the key on and 12 red and 0 white with the key off . This is with the white alternator plug out of the alternator.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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09-10-2017, 09:16 AM | #12 |
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Re: Alternator with internal regulator
I'll double check these tonight,
Before I got 0 and 0 when I pulled the white plug. I got 8.something volts on #1 plugged in 11.9 volts on #2 when plugged in. |
09-11-2017, 11:40 PM | #13 |
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Re: Alternator with internal regulator
So pulled these numbers
Key off Big red 12.5 Sm red 8.9 White 12.3O uh Key on Big red 12.3 Lil red 11.7 White 12.3 Running Big red 12.0 Lil red 11.4 White 12.0 Lights on Big red 10.9 Lil red 10.1 White 10.8 Replaced the new alternator and got these. Key off Big red. 13.11 Lil red 0 White 13.1 Key on Big red 12.69 Lil red 12.05 White 12.65 Running Big red 14.6 Lil red 13.5 White 14.6 Lights on running Big red 12.4 Lil red 11.3 White 12.25 Even with the alternator removed and all the under dash fuses removed I still had the light on for my drain test. I could also notice the battery draining when not on the trickle charger just watching the multi meter. |
09-12-2017, 11:17 AM | #14 | |
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Re: Alternator with internal regulator
......................
Quote:
The little red wire should always be the same as the battery voltage. I'm puzzled why you got zero on it at some points unless you pulled the jumper plug when you checked it. When you disconnected the alternator wires and the drain stayed it might be because the red wire in the regulator plug was jumping to the brown wire and feeding the key switch and the ignition wire. Have you had any problems with the engine running after you turned the key off?
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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09-12-2017, 12:32 PM | #15 |
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Re: Alternator with internal regulator
I'm not sure I got which plug correct, apologies for making you guys repeat yourself. So starting over
removing the lmc adapter plug key off measured at the factory plug WHite #1 0 v Blue #2 0v Big red 12.5v Key on at unplugged lmc #1 white 0 #2 red 0 Big red 12.3 Lmc plug in, alt plug out key off measuring at alternator plug Number one white 12.6 Number 2 red 0 Big red 12.5 LMC plug in alternator plug out key on measuring at alternator plug Number one white 12.5 Number 2red 11.9 Big red 12.5 Thanks for the patience folks So I'm guessing I need the rewire number one and two wires because they're backwards |
09-12-2017, 02:14 PM | #16 |
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Re: Alternator with internal regulator
Switched 1 and 2, it's making more voltage and there is no drain when off. Also now 2 is always hot and 1 is key on hot, thanks
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09-12-2017, 11:08 PM | #17 |
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Re: Alternator with internal regulator
Sounds like a winner!
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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