This line provides ground to that relay and is N-O when CU is OFF, and is N-C for all other control functions. The Off switch on the CU is `sticky` as I mentioned before. Several questions: 1) Can I substitute AC Delco CU p/n 15-71886 or p/n 15-71932 for p/n 15-71887 (GM #16145214), if one or the other is easier to find All three units have the same mounting tabs
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and show the same push-buttons in a different configuration on the front. 2) Is the switch that controls ground to the blower speed relay an internal transistor If so, which one 3) I`m not inclined to want to spend $250-500 for a replacement CU, even if I can find one in the free world. Is there an AC Delco electronics service center that can repair the unit Where would I find it on-line 4) Barring finding a replacement CU at a reasonable price, where would I jumper the control line to the blower speed relay to a different ground to create a permanent ON signal to the blower resistor Can I jumper it to the ground line (known good) on the C2 connector that connects ground to the CU itself I think I did. As I said above, the control line (ground) from the dashboard control unit to the blower speed relay is intermittent (95% sure this is the fail point). This line applies a ground signal to the blower speed relay which controls the blower. It is controlled by a switch of some kind on the control unit circuit board. I don`t know if the switch is a multi-pole switch that is hardwired to the bank of eight buttons on the control unit (with OFF being an open [no ground signal applied ~ relay not energized] and all other buttons being closed [ground signal applied ~ relay energized]), or it may be a transistor that has one leg wired to the seven front panel buttons that control AC/heat. Do you know If this is a manual system my...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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