Detroit Speed Selecta-Speed 121633 User manual

DSE F501-300 (Rev 06/28/19) Page 1 of 15
Detroit Speed, Inc.
Selecta-Speed Wiper Kit
1973-83 C10 GM Truck
P/N: 121633 & 121634
A downpour of rain will no longer hinder your ability to clearly see the road. The Detroit Speed
Selecta-Speed Wiper Kit provides you with the performance and convenience of a late model
wiper system in a package that easily and cleanly mounts in your 1973-83 C10 GM Truck.
Figure 1 –PN 121634 Shown
Item #
Description
Quantity
1
Wiper Motor Assembly
1
2
Wiper Control Module w/Mounting Plate
1
3
Wiper Harness
1
4
Wiper Switch Assembly
1
5
Hardware Kit
1
6
Instructions
1

DSE F501-300 (Rev 06/28/19) Page 2 of 15
This kit features a seven speed wiper system with five delays, low speed, and high speed. The
new pitman arm, included in the kit, connects directly to your existing wiper linkage. A rotary
switch is also included, along with a complete wiring harness.
This kit does feature a washer pump option as the wiper switch does have a push button
function. The wiring harness/control module is equipped with a power and ground wire to install
an inline electric washer pump. Detroit Speed does offer a washer pump kit available as part
number 121102.
Hardware Kit Checklist –Detroit Speed 1973-83 C10 Wiper Kit
Part Number
Description
Quantity
Check
9312209
1973-74 C10 Hardware Bag
1
9312206
Wiper Switch Adapter Assembly
1
9912060
1-1/4” Firewall Grommet
1
9912244
Billet Aluminum Wiper Switch Knob
1
9912044
3/8” AN Stainless Steel Washer
1
950054FS
10-24 x 3/4”L Button Head Screw
3
980096FS
5/16”-18 x 1”L Hex Head Flange Bolt
1
970043FS
5/16” SAE Washer
1
960033FS
5/16”-18 Nylock Nut
1
9312212
1975-83 C10 Hardware Bag
1
9312210
Wiper Switch LED Light Box Assembly
1
9912365
Acrylic Wiper Cover Plate
1
9912367
LED Dimmer
1
9912364
Pre-Wired White LED
1
9912366
2-Wire Lever Terminal Block
4
9912060
1-1/4” Firewall Grommet
1
9912244
Billet Aluminum Wiper Switch Knob
1
950128FS
No. 8 x 5/8”L Sheet Metal Screw
2
950054FS
10-24 x 3/4”L Button Head Screw
3
980096FS
5/16”-18 x 1”L Hex Head Flange Bolt
1
970043FS
5/16” SAE Washer
1
960033FS
5/16”-18 Nylock Nut
1
Installation Instructions:
1. Before beginning, please ensure that the parts included with your kit match the parts list
above. Ensure that the factory wiper system is in its “Parked” position. Disconnect the
battery power by removing the negative battery lead from the battery.
2. Mark the wiper arms’ parked location with masking tape for reference (Figure 2 on the next
page). It will be easier to access the wiper linkage with the wiper arms midway through their
travel.

DSE F501-300 (Rev 06/28/19) Page 3 of 15
Figure 2 –Parked Location
3. Remove the 3 bolts holding the stock wiper motor to the firewall.
4. Disconnect the wiper linkage from the wiper motor pitman arm and remove the stock wiper
motor from the firewall (Figure 3).
Figure 3 –Remove Stock Wiper Motor
5. The original wiring will not be used with the new Selecta-Speed Wiper Kit. A custom harness
is provided to replace the original harness. NOTE: If you decide to cut the old wires please
pay special attention to properly terminate the wire ends to avoid possible shorting.
6. Mount the new wiper motor assembly to the firewall. Use the three supplied 10-24 x 3/4”L
button head screws to mount the wiper motor assembly to the firewall. The adapter plate
will mount to the firewall using the original wiper motor firewall weld nuts (Figure 4 on the
next page).

DSE F501-300 (Rev 06/28/19) Page 4 of 15
Figure 4 –Attach Wiper Motor to Firewall
7. Attach the new pitman arm to the original wiper linkage. NOTE: The Selecta-Speed wiper kit
is shipped with the pitman arm in the “parked” postion. Do not move the pitman arm by hand
to attach the wiper linkage. If the pitman arm is moved from the original “parked” position
from Detroit Speed, it may result in the wiper blades stopping in the wrong spot on the
windshield.
8. The Selecta-Speed switch will replace the stock switch. Remove the screws holding the
gauge panel to the dash and remove. CAUTION: The gauge panel can flex a little, but on
certain trucks, it is necessary to remove the headlight knob first in order to remove the
gauge panel. Pull the headlight switch out as far as it will go. Press down on the release
button and pull out the headlight knob (Figure 5).
Figure 5 –Remove Headlight Knob
9. Remove the 2 screws holding the stock wiper switch to the dash (Figure 6 on the next page).
Disconnect the wiper switch connector from the back of the wiper switch and remove the
switch. For 1973-74 vehicles, tie up the original wiring under the dash and skip to Step 23.
For 1975-77 vehicles, proceed to the next step. For 1978-83 vehicles, skip to Step 11.
Push to
Remove Knob

DSE F501-300 (Rev 06/28/19) Page 5 of 15
Figure 6 –Remove Factory Wiper Switch (1973-74 shown)
10.Once the switch is removed from the dash, remove the light bulb housing by turning it
counter clock-wise in the switch housing. In order to use the LED light for the new wiper
switch, you will need to cut the wires from the original light bulb housing. Cut the gray
(positive) and black (ground) wires as close to the terminals as possible. Skip to Step 12.
11.Once the wiper switch is removed from the dash, you will need to cut the “A” and “E” wires
from the back of the original wiper switch connector in order to use the LED light bulb (Figure
7). NOTE: The “A” wire is gray (positive) and the “E” wire is black (ground). Cut the wires as
close to the terminals as possible.
Figure 7 –Cut “A” & “E” Wires
12.Strip the wires in the vehicle that were cut for the light bulb, the wires on the provided
dimmer, and LED wires for the provided two-wire T-junction connector. Use the indicator on
the bottom of the T-junction connector to ensure that enough wire is stripped (Figure 8 on
the next page).
“E” – Black
Wire
“A” – Gray
Wire