After a couple hour search on the Dual Alternator subject, I decided to ask this question in a new thread.

Does anyone have a wiring diagram (or can explain in detail) on how to wire up the second alternator on an LLY?

Please don't refer me to buy the "kit" from a certain vendor (no offense), I already have the parts, but need to know where the second alternator's wires go. The large one is obvious (goes to red box). I need the 4 pin plug info.

I also understand the LLY is different from the LB7, thats why I posted in the LLY section.

Thanks!

Ok, I won't say to buy a kit from the "vendor" here, but you can still ask him about the wiring....

Well I think that the supporting vendor might be able to sell you the diagram.. Good luck..

Ok, I won't say to buy a kit from the "vendor" here, but you can still ask him about the wiring....

Thanks Tom, It's not that I wouldn't patronize this vendor, I'm just trying to save a few $$. I hate to ask him for answers and not buy his kit. With a friend in the salvage business, free parts are cheap. If I get no answers, I will call on him & buy some stuff to show my appreciation. Lord knows, we all need "stuff". :)

I can't tell you for sure about the LLY but when I did mine I only had to use one wire from the alternator to the ECM for a turn ON wire.

Also I would imagine that you could splice into the wire that turns on the original alternator.

And the big charging wire to the Red box.

DD

.

This"vendor" referred to here is a pretty straight up guy, and has been helpful to everyone on here no matter whether they buy from him or not. No body blames you for trying to save a buck by getting free wrecking yard parts, and he won't either. Email him and ask him. His reputation has been built by the service, advice, and help he has given others here and elsewhere. He is a very astute businessman who knows what it takes to run a great business and have a great reputation. I'm betting he would be delighted to help you. Just don't ask him to warrantee the parts should you have a problem down the road.

Gardnerteam,

I think D3 may just not want to offend that person (and you and I both know who he's talking about....its in my sig...), but seriously...this person is more than willing to help people that are doing something different and need advice.

ok, so at what part does this certain vender jump in and answer the q?

See...told ya! Hi Eric! :lol:

Hey Eric, I figured it out... I just didn't want to step on, err, someone's toes (livelyhood). Like I said before... Free parts are cheap. Just trying to save a buck. If I didn't have access to this, I'd buy the kit, mainly for it's hassel free installation.

For those wondering, here's the schematic...

Hope it's not too small to read, I had to shrink it.

Eric, I have the factory dual alts. (105 amp each). If I bought a couple of the 145 amp alts that you sell, would they bolt right in, or are they a different size? I'm thinking they would not have to work as hard as the 105's (when rving, etc.) and would therefore last quite a bit longer. I could keep the 105's as spares. Any other parts that would also need to be be changed (fusable links, etc.)? Thanks! :confused:

While contemplating that question Eric, wonder if you could tell me why my second 145 causes an intermittent DIC charge warning. When I unplug it, DIC stops. Driving me crazy

BTW, did you get those links I sent you for the smaller pulleys?

Eric, I have the factory dual alts. (105 amp each). If I bought a couple of the 145 amp alts that you sell, would they bolt right in, or are they a different size? I'm thinking they would not have to work as hard as the 105's (when rving, etc.) and would therefore last quite a bit longer. I could keep the 105's as spares. Any other parts that would also need to be be changed (fusable links, etc.)? Thanks! :confused:

The only thing that might be different is the steel bracket. It probably takes a slightly longer serpentine belt. 145's are larger in diameter so there center positions are further out. Everything else is plug-n-go. my wife's Tahoe has one 145. I will check it to see if the bolt locations are the same.

I am getting a 5th wheel in the spring and wanted more amperage to charge the batteries. If twin 105's aren't enough, twin 145's will take their place. Hopefully, I won't have to run a heavier gauge wire to the camper, but probably will for safety.

i cant read the scematic. email me the fullsiz eand ill post it on my webpage in full view

I was TOLD, that the 105A alts put out better amperage at idle than the 145A's. Has something to do with the way that they are wound. Idle is usually when you need better amperage, I would think.

I don't know if this is specific to the GM/Delphi units, or all of them. If anyone has any better info on this, let's hear it!

Ty

I can't imagine many people needing more then 2 105 amp alternators!

Not even 2 of my car audio amps could run off of 210A. :eek: :ro)

The output of a new 105, maxes out at around 80 at our low rpm limit. Age takes that down to 70. Truck uses 30-40. Aftermarket stuff, another 50.

Nothing left to charge the battery :)

Ok of course there are exceptions. My single little 105amp keeps up with my mild electrical upgrades.

I can't imagine many people needing more then 2 105 amp alternators!

I had this same thought. With a single 145A, most people might rarely load the second 145A, with the exception of cold starts at idle.
I had thoughts of at some point replacing my single 105A with a single 145A, to increase the at idle amps above the 46A rating of my 105. I know the 130A is rated at 67A at idle, but I never saw a idle amp rating for the 145.
Does anyone know the idle amp rating of the 145?

I had this same thought. With a single 145A, most people might rarely load the second 145A, with the exception of cold starts at idle.
I had thoughts of at some point replacing my single 105A with a single 145A, to increase the at idle amps above the 46A rating of my 105. I know the 130A is rated at 67A at idle, but I never saw a idle amp rating for the 145.
Does anyone know the idle amp rating of the 145?

Interesting. Where did you get this info? Helms? Just curious, as i received info that was to the contrary. Then again, I may have misunderstood...

I have the Helms 2002 Manuals. I’ve never been able to find much info there, as to how the ECM is programmed to control anything.
The info I stated about barely loading the second alternator is from info I read from several people on this site, which I can not verify, but it is what I heard.
These posts have stated that the ECM controls the output of the alternators. The primary alternator seems to hog most of the load until it’s at some upper load amount, and then the ECM allows the second alternator to start suppling some of the load.

Here is probably the post I got this info from. Note the last paragraph of Hoot’s post.
http://dieselplace.com/forum/showthread.php?t=677&highlight=dual+alternator

If what I stated is wrong, I’m sorry, and someone please correct me. I’m normally careful not to repeat “hearsay”, (if I’m not positive it’s correct), so I don’t misinform anyone. As you here the same info repeatably, you start to believe it.

Maybe Max Power or Eric can add info.

I have an extra 105A alt, with less than 2K miles on it, oem off my new truck.
email if interested.

Eric, what does your kit cost? Does it include the 2nd alternator or do I need to get that from the dealer? How much should the alternator cost if I need to get it from the dealer? Is installing a 2nd alternator complicated? I just don't want to F*** it up. Thanks

I can't imagine many people needing more then 2 105 amp alternators!

Don't really need them, but my past experience in towing an rv while charging a bank of house batteries has shown that the less your alternator has to work to keep up, the longer it's going to last. I have a 200 watt ambulance alternator in my old truck.

Plus, aren't most of us on this forum a little past the "need" phase on our trucks?! :D

:funnypost

My 2 generators are great while charging the RV, running the truck and firing off 600 watts of lights to see where I'm going. The needle never moves from above 14v.

Go here...

http://www.gmupfitter.com/publicat/2004_BB/2003_Beyond_LD_Electric_CK.pdf

The schematic is on page D138

Is the wiring for the LLY the same as the LB7? The diagram date is 3/04 and it states it is for an LB7. I need to know as my kit from Eric is due any day now.
TIA

Max

Is the wiring for the LLY the same as the LB7? The diagram date is 3/04 and it states it is for an LB7. I need to know as my kit from Eric is due any day now.
TIA

Max

The wiring is the same from '03 to '06. The difference (I come to find out) is the terminals (or as some like to refer "pins").

WWW.DANDECOBB.COM (http://www.DANDECOBB.COM)

here is Diesel_Day_Dreamin' (http://www.dieselplace.com/forum/member.php?u=13911) vbmenu_register("postmenu_863163", true); s diagram. scroll down to the bottom of the page and you will see it.

Thanks for hosting the diagram duramaxdavid... One of these days I'll figure out how to do that fancy computer stuff.

For those who are still puzzled, tie the two "B" wires together.

Thanks mystery member ;) .

no problem

For you Rvr's if you are charging through the trailer connector the max you will be able to charge is 40A. Like Max Power said the double 105s are already overkill.

Check my measurements http://www.dieselplace.com/forum/showthread.php?t=60346


CUL
Marco Polo