B2400 Dynamo to ACDelco 12 SI alternator wiring help!

[chpensyl]

Fitting a 78 amp Delco Alternator into my B2400 to run light bar and back LED's, need to understand how to delete factory Voltage Regulator and run the new wires (2 spade connections and 1 Batt post connector), any help would be greatly appreciated!

Thanks in advance,
Chuck

 

[85Hokie]

let me ask the dumb question first.........
will your current dyno not handle that amperage?

 

[chpensyl]

let me ask the dumb question first.........
will your current dyno not handle that amperage?

Not even at a faster idle, added LED Headlight bulbs 1156, a 22" light bar and 2 LED Small floods to the rear. Used them to light up a trailer we were loading, ran it for 2 hours and battery was dead, had to jump it. After looking at the wiring coming out of the voltage regulator, I'm thinking that the RY and WR are the 2 that get connected to R1 and 2 on the alternator, but not sure which go to where.

 

[chpensyl]

Not even at a faster idle, added LED Headlight bulbs 1156, a 22" light bar and 2 LED Small floods to the rear. Used them to light up a trailer we were loading, ran it for 2 hours and battery was dead, had to jump it. After looking at the wiring coming out of the voltage regulator, I'm thinking that the RY and WR are the 2 that get connected to R1 and 2 on the alternator, but not sure which go to where.

Top pic connection into voltage regulator, bottom is coming from the regulator.

 

[lugbolt]

easier and 1000% more reliable to put a kubota alternator on it, look at a bx tractor they have alternators and not dynamo's and last nearly forever, which is more than I can say about a GM alternator

then you have to figger out what the voltage regulator wires do, study the wiring diagrams

 

[85Hokie]

VR is built in - so this can run straight to battery

 

[chpensyl]

easier and 1000% more reliable to put a kubota alternator on it, look at a bx tractor they have alternators and not dynamo's and last nearly forever, which is more than I can say about a GM alternator

then you have to figger out what the voltage regulator wires do, study the wiring diagrams

Ya, I kinda jumped into it without doing enough homework, just msy have to take my lumps and do that, thanks for the info, it is a challenge tho!

 

[chpensyl]

VR is built in - so this can run straight to battery

View attachment 51800

So with this setup, would i have to do anything (jumpers, etc) with any of the outgoing wires from the original voltage regulator?

 

[Dave_eng]

My experience is that the charge bulb is critical in having the GM alternator turn on. Too low a bulb wattage and charging may not happen or require the engine to be rev'd up significantly before it turns on.

There is a technique to turn the Delco installation into a one wire one with a jumper eliminating the charge indicator bulb completely.

Just unplug the existing regulator connector.

Dave

 

[chpensyl]

I have to say, you guys are GREAT, thanks a million for all the help and information! Thanks Dave, I appreciate it!