B3, B4?

[RobWood]

How do you tell the difference between a B4 and a B3. I am looking at wiring diagrams and wanna make sure I am looking at the right diagram.

[Dave72dt]

Easiest way I know is to look at the rear fenders.  The flat surfaced round ones are 3's and earlier, the long rectangular ones or 4's and were used for quite a few  years since then.

[Jeff Balazs]

There are some other differences as well. Different badge on the dash for one.

Also the rear fenders may not be a 100% identifier as I am pretty certain the cycle style fenders were still standard on the express models.

 

On the subject of wiring ........ there shouldn't be any real significant difference between the 2 years. Accessory items like heater fans and turn signals probably have much more effect on it than a years difference.

 

Jeff

[ggdad1951]

rear fenders, dash badging, and grill badging are the 3 easiest ways to tell.