Hello B21A Folks,

I have traced every wire attached to the B21A engine. I need to verify a couple of wires, just to be sure. Then I will come up with the proper lengths and gauges for each, et cetera, before making a wiring diagram.

Thus far:

B21A Engine Wiring Harness

Gray Connector on Firewall
___________
| |
Yellow/Blue Stripe |O O |Black (to Oil Pressure Sender,#1 Distributor)
(to Starter Left Side |X O |Yellow (to Temperature Sender)
|X O |Red (to Alternator)
Brown |O O | Red/Blue Stripe (to Fuel Shutoff Solenoid)
(to Alternator and |_________|
Distributor

Bosch Alternator
Red
Thicker Red Wire & Brown Wire
Other Wires to Voltage Regulator
Thicker Blue Wire (Negative) to Battery


Coolant Temperature Sender
Yellow Wire


Fuel Shutoff/ Anti Run On Solenoid
Blue Wire and Red/Blue Wire


Bosch Distributor 0231170284 JFU4 5091
Black Wire


Constant Idle Speed Compensator Solenoid Firewall
Blue Wire


Bosch Coil
#15 Two Brown Wires
#1 Black Wire to Distributor Condenser


Starter
Right Terminal 2 Brown Wires, one goes to #15
Terminal
Center Bolt Terminal Thick Red to Battery, Not so
Thick Red to Alternator


Battery
Thick Blue to Alternator Ground
Thin Blue to Body Ground
Thick Red to Starter
Not so Thick Red to Bus Bar on Fender


Wire Color List:
Yellow/Blue Stripe
Brown
Black
Yellow
Red
Red/Blue Stripe
Blue

Need help to confirm:
Gauge of Wires
Length of Wires
Brown Wires interconnected
Black Wires interconnected
Blue wire piggy-backed to Red/Blue to Fuel Shutoff Solenoid