Electric Instructions

Thanks for purchasing your throttle control from #1 Stop Products. Please read the enclosed instructions first before attempting installation. If you have any questions, please feel free to contact us.

  1. Remove carburetor
  2. install longer studs (NOTE: If a spacer was not run under carb, longer studs are required. They may be made from threaded rod or purchased from your speed shop or from your #1 Stop Products Dealer.)
  3. Install an open plenum style carb gasket on manifold.
  4. Install #1 Stop on manifold. Solenoid should be opposite side of carb throttle linkage. Note: Dominator stops can be mounted on either side. Check clearance on linkages on both Std. Holley and Dominators.
  5. Install carburetor. Note: Be sure to use a 4 hole carb gasket between carburetor and #1 Stop. An open plenum gasket will allow the fuel mixture to move from hole to hole and cause turbulence. This will cause inconsistency when the stop is in use.
  6. Install fuel lines on carburetor. DO NOT allow fuel lines to rest or touch the solenoid or bracket. This will cause the solenoid to bind. It can cause the stop to work erratically and possibly blow the fuse or burn up the solenoid (see warning label on solenoid).
  7. Wiring: use 10 GA wire on all circuits.

"High Gear Stop" wiring
  1. Use heavy duty switch to mount on your shifter for a high gear stop. For suggested wiring for "High Gear Stop" See wiring diagram H.G. (Figure 3).
  2. Mount the enclosed switch on your shifter so when you the shifter is in low gear the switch is "made". (A bracket to mount your switch on a quarter stick shifter is available from #1 Stop Products. Mount enclosed fuse bracket in a convenient location.

When wiring, please try and follow these suggestions for best results.
  1. Use good 12 volt power source. Do not take power at a point that has already several other uses (fuel pumps, fans, etc)
  2. Try and keep wire lengths short and make sure all connectiosn are secure and properly insulated.
  3. If you install an override witch (a 30 amp switch is available from your #1 Stop Dealer) make sure it is a quality switch.
  4. Make sure you have a good ground (do not ground to aluminum interiors).
  5. An On-Off switch (optional) may be used to turn off throttle stop when it is not used (for bracket racing) and stop knob can be screwed in to hold stop open.
  6. Do not use a fuse larger than 10 amp "slow blow" fuse (Buss #10 MDL)

After wiring, before testing equipment, open stop manually making sure that nothing interferes with the Solenoid, linkage or blades. The solenoid must be able to seat properly or it will not disconnect the high force coil and may cause the fuse to "blow" or damage the solenoid.

Note: Your #1 Stop Throttle Stop is equipped with an "internally" switched duel coil DC solenoid. In the installation of "internally switched" duel coil solenoids it is CRITICAL that the plunger be allowed to travel to its FULLY SEATED POSITION. This will permit the plunger to automatically open the switch to the high current coil winding eliminating the chance of oil BURNOUT!

CAUTION!!! Solenoid adjustment is CRITICAL. Coil burnout will occur within 2 minutes if "internal switch" is not opened to disconnect the high current winding. If in doubt, contact factory for further instructions.

CURCUIT PROTECTION!!! A slow blow fuse should be wired "in line" with the solenoid to protect it from burnout if a jammed linkage or restricted should occur. The following fuse size is recommended.

BUSS FUSE: MDL 10 FOR 12 VDC systems

One last time manually move linkage through it proper movement and visually inspect for restrictions. Energize the solenoid, check for proper stroke and operation. After 30 seconds, feel the solenoid, if excess heat is felt on the solenoid, recheck solenoid adjustment.


Make sure that the timer you are using is capable of handling the amperage required. It is recommended that a relay (30 amp. Min.) be used on timer installations. A bosch 30 Amp Relay is a good choice. Wire per diagram on side of relay.


High Gear Stop

This type of stop is triggered off the shifter (Stop open in low gear, closed in high gear). To quickly dial the car in when limited time trials are available and no previous testing is done (if possible try and dial the car in ahead of a points meet or national event).

  1. Turn Stop knob so that Stop is full open when solenoid is activated.

  2. Turn Stop knob 10 full turns out and lock nut (always record Stop position or every run along with results)

  3. Make a run and record time and adjust using .01 per mark to run what you want to run and run the second time trial. EXAMPLE: S/G 1st run at 10 turns, car runs 9.80. On the second run, try to run 9.92 to 9.95 using .01. Estimate per mark 9.93 - 9.80 = .13 or 13 marks on adjustment knob. To slow car down adjustment know moves away from cam. The second run will then tell how close the .01 estimate is. Your actual adjustment may be from .005 per mark to .03 per mark. Make changes again to dial the car in on the third run. When adjusting this Stop, remember that there are 3 significant factors that affect a perfectly running race car:

    1. 60 ft. time. Any change here affects your total E.T. On a "high gear" type stop. The stop does not affect the 60 ft. time. It is extremely important to be consistent here.

    2. Weather (air quality). We know that our racer will go quicker in cool air than it will in the heat of the day. Any step to record air quality and how it affects your car will help you dial-in more accurately. (Wind is also a weather factor that affects your car)

    3. Your T.S. Also affects your E.T. Remember, if you set your stop .03 slower and your 60 ft. speeds up .04 and weather is .01 faster, you will go .02 faster than the previous run even though you set the throttle stop to run slower.


The most popular timer applications! Use a small amount of time in the first timer (.010 – 0.30 to allow full throttle for reaction time) then an adjustable period of time "on the Stop" (stop closed). Then open for a MPH charge. This has several advantages:

  1. By going on the Stop early in the run may help keep the car hooked up on a marginal race track.

  2. A "slow" 60 ft. may fool your opponent into thinking your reaction time was slower than it actually was.

  3. By slowing the car down early in the run, you tend to keep most of the competition in front of you so you can view him and the finish line at all times (he should then have to look back to see you and take his eyes off the finish line)

  4. By having a higher MPH than most of your competition, it makes it hard for your competitor to judge your car.

  5. A correctly set up T.S. Setting and timer application is very accurate and lends itself to a throttle stop weather computer. (Caution: when you set up your throttle stop and timer, make sure that you:

  6. Do not have too much throttle stop restriction that your timer will open you up before your 60 ft. time. Example: If your first timer is 0.30 seconds and your second timer is 1.00 seconds and your 60 ft. is 1.45, you need to open your stop (Use less turns of T.S.)

  7. Make sure when you adjust your 2nd timer to adjust your E.T., that the total range of your adjustment will always stay on the same side of your shift point (ie always opens before your shift or always opens after your shift). If you are opening before your shift point and may get close, simply put more restriction (more turns) in your throttle stop. Example: A good rule of thumb on a S/ST, S/G and S/C car with suspension is 0.30 sec. In the first timer, 2.00 sec. In the second timer and 12 turns in throttle stop.

  8. When initially setting up your Stop Timer combination, try to anticipate different conditions that you will encounter during the course of the season so that you can pre-test these conditions.

  9. At points races and national events, make runs with an eye on the weather and track conditions that will prevail on race day.