Connect the # 0610501 to the # 0610502 harness (C583 connector on both harnesses).

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12. Install two plasma cluster modules in the HVAC duct on the condenser side of the vehicle.
•

Position the supplied # 454479 template on the top part of the duct (template must contact the
upper metal edge).

•

Using a sharpie, draw the perimeter of the template on the insulating material.

•

Also draw the position of the two inside opening & the position of the 10 support plate screws.

•

Cut both marked openings in the duct (cut through the insulating material and the plastic duct).

•

Drill all screw marks using a 1/4 inch drill bit.

•

Cut the insulating material around the two openings following the previously scribed perimeter
mark (do not cut through the plastic duct).

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•

Inside the vehicle, install the # 454469 and the # 454466 supports on each side of the duct
opening. Use 4 supplied # 500957 screws for each support, two on the top and two on the side of
the duct.

IMPORTANT: Before the installation of the support remove any sealant accumulation or insulating
material that could prevent the straight and square installation of the support.
•

Install a # 0610449 plasma cluster module to each support using only one loose screw so it can
rotate freely (# 502779 & # 500855 screw & washer).

•

Pass the connectors Plasma 7 and Plasma 8 of the # 061501 harness inside the duct(pass over
the diffuser) so they can be reached from the 2 cut openings.

IMPORTANT: Make sure the connectors wires are passing away from any sharp edge.
•

Connect the Plasma 7 & 8 connectors at the back of the plasma cluster modules (order is not
important).

•

Install the missing # 502799 screws and # 500855 washers and secure the modules to the
support (do not overtight).

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•

Apply a length of supplied # 506268 foam tape around the edges of the # 454471 condenser duct
cover.

•

Install a # 5002071 spring nut at each screw position around the duct openings.

•

Close the duct opening with the # 454471 cover and 10 # 500957 screws.

•

Optional, stick some insulating material back to the cover using spray contact cement or
aluminum conduit tape.

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13. Route the Plasma 9 & the Plasma 10 connectors inside the right (condenser side) parcel
rack frame.
•

Remove the window pillar cover and the parcel rack HVAC cover.

•

Remove the wall upper and lower rails fasteners in the pillar area

•

Fish connectors Plasma 9 Plasma 10 from the deflector area up to the base of the window
(pass behind the carpeted lateral panel).

•

Pass the connectors wiring along the window pillar up to the underside of the parcel rack.

•

Pull out the connectors from the upper grommet in the parcel rack floor (next to the HVAC unit).

NOTE
In some vehicles not equipped with parcel rack doors,
the hole & grommet may not be present.
In this case, the hole must be drilled using a suitable
hole saw and the provided # 504534 grommet.

On vehicles equipped with a wheelchair lift (WCL) the
front WCL door pillar and lower cover must be
removed.

•

Pass the connectors in the lower floor grommet (HVAC harness grommet).

•

Remove the over head light/register console to access the connector from under the parcel rack
HVAC unit.

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14. Install 2 plasma cluster modules # 0610449 in the area below the right parcel rack HVAC
unit.
•

With a sharpie, mark the location of the # 314937 supports (2X) on the inner parcel rack rail. Both
supports must contact the extrusion edges, one on both sides (the support back shape must fit
the ribbed extrusion profile horizontally as shown).

•

Drill the 4 mounting points for a # 8 screw (1/8 or 9/64th inch drill bit).

•

Install 2 of the supplied # 0610449 plasma cluster modules on the supports using supplied #
502799 screws and # 500855 washers.

•

Connect the Plasma 9 and the Plasma 10 connectors (previously routed to the underside of the
parcel rack) to the two modules. Leave +/- 6 inches of wire behind the module to ease future
removal / installation during maintenance.

•

Secure the supports (and modules) to the extrusion using the supplied # 500443 screws.

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15. Connect the plasma cluster system to the vehicle power source.
•

In the evaporator compartment, locate the R12 relay and the ground stud on the firewall.

•

Connect the power terminal of the plasma cluster system to the middle terminal of the R12 relay.

•

Connect the ground terminal of the system to the ground stud.

•

Make sure both 5 amp fuses in the system are good before powering the vehicle.

•

Reinstall all trim parts and seats in the vehicle and proceed with the test procedure at the end of
this document to ensure proper function.

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16. Apply the Prevost EnviroCare decal on the vehicle body.
•

Clean the area just behind the H345 crest near the entrance door. Use isopropyl alcohol or anti
silicone (Some other decals may also be present in the area).

•

In Canada, carefully apply the bilingual decal # 0610528 just above any already installed factory
decals (leave around 10mm gap between decals).

•

In the United States, carefully apply the english decal # 0611019 just above any already installed
factory decals .Leave around 10mm gap (3/8in) between decals.

IMPORTANT: Make sure the surface is clean and dry. Do not apply in cold temperature, heat the area as
necessary to ensure proper adhesion.

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PLASMA CLUSTER INSTALLATION - IN VEHICLE TESTS

TESTER CALIBRATION

1. To operate the meter, flip the POLARITY switch to its center position, halfway between "+"
and "-", and the MEASURE switch to the STANDBY position.
2. Turn the RANGE knob to the 199.9 position.
3. Wait until the display becomes stable to within +/-2 counts. This will take about 10 seconds
after the meter is turned on.
4. Adjust the OFFSET knob so that the display reads zero +/- 2 counts (+/- 0.02). After this
step, the OFFSET might not need to be readjusted again, ever. However, it should be
checked at the beginning of each measurement session or if the temperature changes
significantly.

NOTE
If you change the knob to another range like "19.99", you will not need to readjust the
OFFSET.

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TEST POINTS & EXPECTED RESULTS:
AT LOWER WINDOW EXITS

1. At the lower window height, the removable
air shroud must be removed for accurate
measurements.
2. Ground the tester to the Audio/Video
mounting plate in the first parcel rack or the
AC unit bodies in the parcel racks.
3. Flip the POLARITY switch to whichever
polarity ("+" or "-") you want to measure (the
MEASURE switch set at the STANDBY
position). Wait for the display to become
stable.
4. Wait at least 10 seconds after flipping the
POLARITY switch then flip to the
MEASURE position (switch upward). This
will turn on the fan.
5. Place the tester opening in the middle of the
airflow exiting from the grille.
•
•
•

•

Take a reading in the center of the
steering wheel.
Take a second measurement in the
middle of the entrance handrail.
On the curb side of the vehicle, take a
reading in the middle of the 2nd and
the 5th windows.
On the curb side of the vehicle, take a
reading in the middle of the 3rd and
the 5th windows.

6. At the 199.9 scale, the readings should top
off and read –I (INFINITE).
On vehicles equipped with a Wheel Chair
Lift, a slightly lower reading of 150+ is
acceptable at the 5th window (behind the
WCL).

Writer: mg

WARNING !
Make sure that the tester airflow (rear fan
area) is not blocked by either your hand,
body, vehicle component (Ex: steering
wheel) or other solid object.

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AT PARCEL RACKS OVERHEAD AIR REGISTERS

1. At the overhead registers, the removable air
shroud must be removed for accurate
measurements.
2. Ground the tester to the AC unit body in the
parcel racks.

3. Flip the POLARITY switch to whichever
polarity ("+" or "-") you want to measure (the
MEASURE switch set at the STANDBY
position). Wait for the display to become
stable.

4. Wait at least 10 seconds after flipping the
POLARITY switch then flip to the
MEASURE position (switch upward). This
will turn on the fan.
WARNING !
Make sure that the tester airflow (rear fan
area) is not blocked by either your hand,
body, vehicle component (Ex: steering
wheel) or other solid object.

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5. Place the tester opening in the airflow
stream exiting from the register grille.

•

Take a reading at the register right in
front of the AC unit.

•

Take a reading at the register located
just after the AC unit.

•

Do both sides of the vehicle (4
readings total).

6. At the 199.9 scale, the reading should top
off and read –I (INFINITE).

Writer: mg