autotronic controls corporation ? 1490 henry brennan dr., el paso, texas 79936 (915) 857-5200 fax (915) 857-3344 msd rpm activated window switch pn 8956 important: read the instructions before attempting the installation. parts included 1 - rpm window switch 4 - self tapping screws note: rpm modules must be purchased separately. see the chart on the last page for part numbers. the rpm activated window switch can be connected to stock ignition systems or msd ignitions. when using a capacitive discharge ignition such as an msd, do not connect the switch to the coil negative terminal. damage to the switch may occur. the switch is capable of carrying 1.5 amps. if the circuit you are activating requires more current, an msd relay, pn 8960 or 8961 must be used. the msd rpm activated switch is equipped with a "smart driver". this circuit will protect the rpm switch from damage by monitoring its temperature. if there is an inadvertant short or too much current is drawn through the switch, the smart driver will sense the increased t emperature and shut the switch off. however, once the temperature drops to a safe point, the smart driver will turn the switch back on. it will continuously cycle on and off as the temperature dictates. if you experience a problem with your switch not operating, turn the circuit off for a few minutes to cool, then try again. if the circuit activates then shuts off, there may be too much current flow. check the device's installation instructions to find its recommended maxi mum cu rrent. the rpm window switch has a circuit that activates a device by providing a ground path at a desired rpm (figure 1). the ground will be removed at a different rpm to deactivate the device. if no rpm module is installed, the device will remain activated as long as the rpm is above the activation amount. figure 1 operation of the rpm window switch. 4 - heat-shrink caps
2 installation instructions autotronic controls corporation 1490 henry brennan dr., el paso, texas 79936 (915) 857-5200 fax (915) 857-3344 cylinder programming the window switch is programmed for 8-cylinder applications, however it can be used with 4 or 6- cylinder applications. to program the switch for different applications, the cylinder select loops must be modified as shown in figure 2. after cutting a wire loop, seal the wire end with the supplied head-shrink caps. use a heat gun or other heat source to shrink the cap for a good seal. figure 3 wiring to an inductive ignition system. mounting mounting mounting mounting mounting the switch may be mounted under the hood as long as it is away from direct engine heat sources. keep in mind that the rpm modules should be easy to access for changes. the switch can be mounted with the double-sided tape or with the four self tapping screws supplied. use the switch as a template and mark the mounting hole locations. remove the switch and drill the holes using a 3/16" drill bit then install the screws. wiring wiring wiring wiring wiring red connects to a switched 12 volt source. black connects to ground. white the rpm input wire. with an msd ignition, this connects to the tach output terminal. on inductive ignitions, it connects to the coil negative terminal. yellow this is the circuit ground wire (normally open switch to ground). it connects to the ground side of the device you plan to activate. note: inductive ignitions only. figure 2 cylinder select loops. cylinders cut loops 8 none 6 red 4 red & blue
installation instructions 3 autotronic controls corporation 1490 henry brennan dr., el paso, texas 79936 (915) 857-5200 fax (915) 857-3344 figure 4 wiring to an msd ignition control. figure 5 wiring with an msd relay. note: capacitive discharge ignitions only.
autotronic controls corporation 1490 henry brennan dr., el paso, texas 79936 (915) 857-5200 fax (915) 857-3344 frm24819 r evised 03/03 printed in u.s.a. limited warranty a utotronic controls corporation warrants msd ignition products to be free from defects in material and workmanship under normal use and if properly installed for a period of one year from date of purchase. if found to be defective as mentioned above, it will be replaced or repaired if returned prepaid along with proof of date of purchase. this shall constitute the sole remedy of the purchaser and the sole liability of autotronic controls corporation. to the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representations whether expressed or implied, including any implied warranty of merchantability or fitness. in no event shall autotronic controls corporation be liable for special or consequential damages. rpm module kits are supplied with five modules in a range of 200 rpm increments. there are even number sets and odd number sets available. example: pn 8746 includes 5,000, 5,200, 5,400, 5,600, 5,800 modules. kit even set odd set 3,000 kit pn 8743 87431 4,000 kit pn 8744 87441 5,000 kit pn 8745 87451 6,000 kit pn 8746 87461 7,000 kit pn 8747 87471 8,000 kit pn 8748 87481 9,000 kit pn 8749 87491 10,000 kit pn 8750 87501 11,000 kit pn 8751 87511 12,000 kit pn 8752 87521 module selectors: these selectors offer 12 different rpm limits at the turn of a knob. note: even rpm in 200 rpm increments only. for rpm settings below 3000 rpm, msd offers an adjustable module, pn 8677 rpm part number 3,000 - 5,200 pn 8670 4,600 - 6,800 pn 8671 6,000 - 8,200 pn 8672 7,600 - 9,800 pn 8673 9,000 - 11,200 pn 8674 10,600 - 12,800 pn 8675 service in case of malfunction, this msd component will be repaired free of charge according to the terms of the warranty. when returning msd components for service, proof of purchase must be supplied for warranty verification. after the warranty period has expired, repair service is charged based on a minimum and maximum charge. send the unit prepaid with proof of purchase to the attention of: customer service department, autotronic controls corporation, 12120 esther lama, suite 114, el paso, texas 79936 . when returning the unit for repair, leave all wires at the length in which you have them installed. be sure to include a detailed account of any problems experienced, and what components and accessories are installed on the vehicle. the repaired unit will be returned as soon as possible after receipt, cod for any charges. (ground shipping is covered by warranty). all units are returned regular ups unless otherwise noted. for more information, call the msd customer service line (915) 855-7123. msd technicians are available from 8:00 a.m. to 5:00 p.m. monday - friday (mountain time).
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