Alternator wiring

[R2u0d5y]

Pictures of my build below.

Hi,

I have used Google, different AI's and searched this forum but wasn't able to find my answer:
Can someone tell me if there is a second wire (d+ or I) on my alternator that needs to be hooked up? It doesn't function anymore (it used to) and there is only 1 wire connected: B+ (BATT).

It's a 1994 7.3 IDI Diesel, most likely from Canada (now in The Netherlands )

Please see the images:

And pictures of my bus:

Thanks in advance for your help.

Greetings,

Rudy

 

[R2u0d5y]

Disappointing that nobody responded...

I took my alternator apart and found it: The connection right above BATT is the d+ (which needs 12V to start the alternator).

 

[ewo1]

How did it function before without that wire?

 

[R2u0d5y]

I have no idea. Last 1,5 years I've driven less than 200 miles so it wasn't needed. So it could be the wire had been missing for a while. No warning light came on by the way

 

[Mr P]

Your alternator looks a lot more like a GM than a Ford. Compare your alternator to the Delco 17si.

Once identified we can troubleshoot.

How to Identify Your GM Alternator

How to Identify Your GM Alternator. Figure out what the difference is between 10Si, 12Si, AD244, CS144 series alternators and more.

alternatorparts.com

 

[#1FordFan]

I agree with Mr P. It does look like a delco alt.
Try to find a wiring diagram for your chassis (Ford,GM, Freightliner…)

Side note: I have a 94 Ford F700. That came factory with a 100A Delco alt.

 

[R2u0d5y]

Thanks @Mr P (and @#1FordFan) it's indeed a Delco (21Si/22Si)

 

[Mr P]

^ If so, here's some good info. Info claims that alt is available as a one wire, two wire, or three wire. A "one wire" alt would only have the large diameter output wire. Other wiring is described in the info.

https://newindo.com/pdf/1G286.pdf

 

[flattracker]

If you would like, I can take pictures of the alternator on a 1993 Ford F250 I have, that has the 7.3L IDIT engine. There is variation in the connections between different alternators. Some alternators only have one wire connected to them. The attached image is a page from the factory manual for the 1993 F250 with the 7.3L IDI-T engine

 

[R2u0d5y]

@Mr P Thanks for the manual! Super handy in case I ever need to fix it.

@flattracker I appreciate it but I already fixed it

 

[Mr P]

Well, care to tell what the fix was??

 

[R2u0d5y]

I took my alternator apart and found it: The connection right above BATT is the d+ (which needs 12V to start the alternator).