removal of generator battery control module

[rustycars63]

2005 5.3 harness trying to remove the Generator battery control module as I do not think it is needed in my 1949 Chevy truck . Any help will be appreciated .

[BR3W CITY]

Bypass the wiring, have your tuner flash the ECM with a 2004 O/S. You won't lose anything you'd need in your swap, and it deletes all the GBCM functions.

[rustycars63]

Thanks very much for your input will give this a try .

[ls1nova71]

You will have to wire it like an '04 also. There aretwo wires that go to the PCM. You may also need an older alternator, the one with the flat plug. When I did my '06 with the round plug, even with it wired and tuned for an '04 it still defaulted to 13.8v.

[rustycars63]

Thanks , i am side tracked on truck for the moment but will follow your advice , thanks again.

[Hart_Rod]

Originally Posted by ls1nova71

You will have to wire it like an '04 also. There aretwo wires that go to the PCM. You may also need an older alternator, the one with the flat plug. When I did my '06 with the round plug, even with it wired and tuned for an '04 it still defaulted to 13.8v.

Mine defaulted to 13.3V (13.8V at the generator output), at least that's what my gauges are showing. I'm thinking about wiring the GBCM back in, as I see a pretty substantial (2V) when data-logging and going WOT and would like for the alternator to put out more voltage when the situation arises.

[ls1nova71]

I probably would if you have it. Seems to me it's a better way of controlling the alternator, and isn't really that much more wiring. It's a couple of power wires and some grounds, then the rest just go between the GBCM and the PCM so there's nothing really to be done. You will have to splice the serial data wire, but that's about it. Here's a schematic in case you need it. The schematic is two pages, even though it looks like one, so that's why it looks funny. I cant put them all on one page and still be able to read them.

[Hart_Rod]

Originally Posted by ls1nova71

I probably would if you have it. Seems to me it's a better way of controlling the alternator, and isn't really that much more wiring. It's a couple of power wires and some grounds, then the rest just go between the GBCM and the PCM so there's nothing really to be done. You will have to splice the serial data wire, but that's about it. Here's a schematic in case you need it. The schematic is two pages, even though it looks like one, so that's why it looks funny. I cant put them all on one page and still be able to read them.

Thanks Eric!

[rustycars63]

Now I have more to think about , thanks for all the input that has been shared .

[rustycars63]

Any one actually using gbcm on their trucks and are there any issues ?

[Daaaanz67]

Originally Posted by ls1nova71

I probably would if you have it. Seems to me it's a better way of controlling the alternator, and isn't really that much more wiring. It's a couple of power wires and some grounds, then the rest just go between the GBCM and the PCM so there's nothing really to be done. You will have to splice the serial data wire, but that's about it. Here's a schematic in case you need it. The schematic is two pages, even though it looks like one, so that's why it looks funny. I cant put them all on one page and still be able to read them.

Doesn't, this require a BCM for the GBCM to work?

[rustycars63]

That,s what i thought also , need more input , thanks

[dayj1]

Originally Posted by Daaaanz67

Doesn't, this require a BCM for the GBCM to work?

Originally Posted by rustycars63

That,s what i thought also , need more input , thanks

For a Gen III GBCM module, a BCM is not required. Here'e the info about how it works straight from AC Delco: https://acdelcotechconnect.com/pdf/imtn_V12I305.pdf

[rustycars63]

Thanks, any special wiring or is the information provided in previous posts the way to go ? Thanks for all the input.

[rustycars63]

Need help I am trying to reinstall gbcm on 2005 5.3 the part number for the plug is a Delphi pa6-gb20-gf10 can not get this number to come up anywhere, also need the part number of the pins that go to plug. Can any help me find them. thanks for your help.

[dayj1]

Originally Posted by rustycars63

Need help I am trying to reinstall gbcm on 2005 5.3 the part number for the plug is a Delphi pa6-gb20-gf10 can not get this number to come up anywhere, also need the part number of the pins that go to plug. Can any help me find them. thanks for your help.

Most of the connectors will be in this catalog. Once you have the correct part numbers, many online vendors will carry them. I generally use mouser.com https://www.powerandsignal.com/docs/...%20Catalog.pdf

[71cadc10]

that string you listed on the connector, is not the part no. It is the recycling code for the plastic...FYI.

The Delphi p/n would be something like 6-8 digits just numbers.
do you have a pic of the connector maybe I could help ?

[rustycars63]

Thanks , for all the help looks like help desk is giving me 13545282 or new number 13545282 as plug number after sent photos to them. Customer service at Mouser .

[ls1nova71]

Originally Posted by rustycars63

That,s what i thought also , need more input , thanks

If you're younger than around 40, you probably wont get this, but I've read this thread several times and every time I see this post, this is what I think of... https://youtu.be/Pj-qBUWOYfE

[rustycars63]

I will have to admit that I am a slow mover on my truck will pick up the pace soon .

[Wildkarde]

Eficonnection.com is a great source of LS connectors and they offer most of them as pigtails.

[dayj1]

Originally Posted by rustycars63

Thanks , for all the help looks like help desk is giving me 13545282 or new number 13545282 as plug number after sent photos to them. Customer service at Mouser .

You probably already know this, but, just in case, the part number you have is for just the plastic housing. You still need the terminals for the appropriate wire size that you're using, the seals, and, possibly, crimpers to attach the terminals to your wires if you don't already have them.

[Hart_Rod]

I hooked my GBCM up per the instructions/wiring diagrams. Nothing changed, still defaulting to 13.8 V. Does something have to be updated in the tune? Is there a way to troubleshoot the GBCM? TIA

[rustycars63]

Did you hook up the Blue wire , engine on signal , some say to store it as its not needed , but, does this control gbcm. The link to the acdelco information is no longer available that i can find. Just thinking out loud.

[Hart_Rod]

Originally Posted by rustycars63

Did you hook up the Blue wire , engine on signal , some say to store it as its not needed , but, does this control gbcm. The link to the acdelco information is no longer available that i can find. Just thinking out loud.

No blue wire in the harness that came with my GBCM. I wonder if I have to turn on the "L" terminal in the tune system options?