C.E. Niehoff & Co. A2-317 Regulator Installation
Converting A2-317 Regulator
to A2-330 Remote-Mounted Regulator
with C803 Alternator on LA Metro Buses
Conversion Instructions
Buses 9500-up late style have IGN, D+, and P terminal wires attached to regulator.
A three-wire harness assembly and pigtail will be provided.
Buses 9200-9400 early style have ONLY the IGN and D+ terminal wires attached to regulator.
P terminal is empty. A two-wire harness assembly and pigtail will be provided.
1. Disconnect battery master switch.
2. Identify and mark wires at regulator IGN,
P (when applicable), and D+ terminals.
3. Cut wires at IGN, P (when applicable), and D+
terminals on regulator close to the terminals.
4. Remove regulator mounting hardware.
5. Remove regulator harness from regulator and
remove regulator.
6. Strip 1/4" insulation from previously cut wires
that connected to IGN, P (when applicable), and
D+ regulator terminals.
7. Crimp extension harness pigtail connector wires:
green to IGN terminal wire, brown to P terminal
wire (when applicable), and white to D+ terminal
wire.
8. Connect extension pigtail to extended harness
assembly and connect regulator connector to the
regulator harness at alternator, tighten securely.
Step 7: Green wire (Pin A)
to IGN terminal wire
Extension harness pigtail connector
with shrink sleeves
V
Harness includes 20 A slow-blow fuse
(Bussman MDA20 or equiv.)
in each fuse holder
V
Connect
this end to
regulator harness
at alternator
9. Route the extension harness along existing
harness in engine compartment above air filter
housing to air intake manifold on side of vehicle.
10. Using P clamps and properly sized wire ties,
secure the new harness where appropriate.
11. Secure regulator end of harness to a vertical pipe
near air intake duct with P clamps.
12. Set replacement regulator setpoint to required
voltage (copy setting from existing regulator).
13. Mount regulator to air intake manifold using
self-tapping screws with connector on regulator
positioned at 12 o'clock (pointing up).
14. Connect extension harness to regulator, tighten
securely.
15. Connect IGN, P (when applicable), and D+
terminal wires to regulator.
16. Connect battery master switch.
17. Start vehicle and verify charge voltage setpoint,
harness routing, and harness support.
Step 7: White wire (Pin B)
to D+ terminal wire
Step 7: When applicable,
brown wire (Pin C)
to P terminal wire
4 places—5mm x 0.8 screws
and disc spring washers
torque to 8.5 Nm/75 lb. in.
Step 15: When applicable,
brown wire from pin C
in 3-pin connector
to P terminal on regulator—
torque to 4.5 Nm/40 lb. in.
V
V
V
P terminal
V
Diagnostic LED
W
V
Step 15: Green wire from pin A
to IGN terminal on regulator—
torque to 4.5 Nm/40 lb. in.
Step 15: White wire from pin B
to D+ terminal on regulator—
torque to 4.5 Nm/40 lb. in.
Figure 1 – Remote Mounted A2-330 Regulator with Extended Wire Harness Assembly
C. E. Niehoff & Co. • 2021 Lee Street • Evanston, IL 60202 Tech Services Hotline 800-643-4633
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