Page 1 of 1
More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 2:21 am
by Pl411
Hello all,
1st I apologize if this has been answered but I've checked techwiki and forums and have found nothing. Plz help, just bought my 1st Roadster and I'm doing the GM is10 Int Reg swap.
I've removed the Mitsubishi Volt Regulator and I don't know what to do with the remaining wires in the 4 and 5 pin plugs. Here's what I know so far.
Taking from the 5 pin connector the Blk/Wht 12v wire to excite the alt. And that's it :
Question 1.
What do I do with the other 4 wires left out of the 5 pin connector that was on the V/R?
Question 2.
What do i do with the 4 wires out of the 4 pin connector that was on the original Alt?
Thank you in advance
20241029_175918 (1).jpg
20250130_142817.jpg
20250130_142800.jpg
20250130_142756.jpg
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 2:50 pm
by redroadster
2 of those wires work the regulator pull the contacts down to make the alt charge PULL current thru the brushes
The other w&b pull the contacts off the Alt no charge/brake lite
Just wrap with tape to protect the multi plug , the reg is in the alt & pulls current with the charge wire
I'd install a 100amp fuse link at batt.
You could remove the neg wire that feeds the charge coil heat shrink insulate it and leave it plugged in for the dash lite operation
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 3:57 pm
by Gregs672000
As Redroadster mentioned, it's highly recommended that you install some kind of protection in the main power line (should be the single wire) in case something grounds. Before my car was rewired with an aftermarket set up, I recall having a 30amp fuse in that line. The only fire I've had in the Roadster was caused by installing an alternator that did not have the insulator at the connection and that wire grounding on the alternator body. My (now very expensive) amp gauge became the fuse. That stranded me on the freeway, and to add insult to injury, as I jumped out of the car to disconnect the battery, a semi-truck drove by and the wind was so strong it pulled the door out of my hand, hyper-extending the door and bending it. Not a good day.
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 4:23 pm
by drieseck
Congrats on the new ride!!
I found this page in the Tech WIKI a good resource:
http://www.311s.org/pmwiki-311/pmwiki.p ... mmDensoAlt
Note the diagram doesn't show the fuses mentioned by Greg and Redroadster, but the narrative DOES tell you where they should be placed.
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 10:25 pm
by Pl411
redroadster wrote: Fri Jan 31, 2025 2:50 pm
2 of those wires work the regulator pull the contacts down to make the alt charge PULL current thru the brushes
The other w&b pull the contacts off the Alt no charge/brake lite
Just wrap with tape to protect the multi plug , the reg is in the alt & pulls current with the charge wire
I'd install a 100amp fuse link at batt.
You could remove the neg wire that feeds the charge coil heat shrink insulate it and leave it plugged in for the dash lite operation
Thank you Sir,
I'll make sure to install the Fuse at battery
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 10:27 pm
by Pl411
Gregs672000 wrote: Fri Jan 31, 2025 3:57 pm
As Redroadster mentioned, it's highly recommended that you install some kind of protection in the main power line (should be the single wire) in case something grounds. Before my car was rewired with an aftermarket set up, I recall having a 30amp fuse in that line. The only fire I've had in the Roadster was caused by installing an alternator that did not have the insulator at the connection and that wire grounding on the alternator body. My (now very expensive) amp gauge became the fuse. That stranded me on the freeway, and to add insult to injury, as I jumped out of the car to disconnect the battery, a semi-truck drove by and the wind was so strong it pulled the door out of my hand, hyper-extending the door and bending it. Not a good day.
Thank you for the heads up.
Sorry to hear that happened to you the Roadster.
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Fri Jan 31, 2025 10:30 pm
by Pl411
Thank you Driesck. Ill re-read that post. It's actually a denso type alt Iam installing.
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Sun Feb 02, 2025 3:31 pm
by Gregs672000
Thank you for the heads up.
Sorry to hear that happened to you the Roadster.
[/quote]
Fortunately that was many many moons ago! But thanks!
I did just burn my BMW to the ground though... got an extinguisher? If not, GET ONE!
Re: More 1967.5 Internal Reg Alt swap questions
Posted: Wed Feb 12, 2025 2:41 pm
by redroadster
To All the. DC electric Flows pos to Neg folks
and not the it flows Neg to Pos ,like I've said
https://youtu.be/0vzcWOEKvjI?si=6J2Vju9yaCiqtrwM
1st part of the video