![]() Some ECMs have both ways on the same ECM, for example the ECM might give you a - to turn the fans on, and a + to turn the fuel pump on. The ECM will then give + when its time to turn that component on. If the ECM trigger is positive, run that + coming out of the ECM to the relay, and the other side of the relay goes to ground. When its time for that component to turn on, the ECM will earth the relay. If the ECM is giving you a negative to turn something on, just get 12 volts to your relay from batt or ignition circuit, then run the relay earth to the relevant ECM pin/wire. These actually can be replaced with plug-in breakers in the panel. Then there are two more fuses.one for each relay.to feed the high and the low beams. If are not lost yet, here's what this means.Ī tiny fuse in the original headlight power circuit does nothing except feed the dimmer swtich, to trigger the high or low beam relay. Only thing the light switch turns on directly is the tail/ parking lamps, "just as they were" OEM. This means the "old" headlight circuit to the original switch is now a tiny fuse for a trigger circuit. "Just an example." Most of my car will be relays.One for IGN/ charging, the Holley HP already has a pump relay, and two more for headlights. A bit of fooling around by a thief will result in a blow fuse for the security relay power, and practically, the only way to swipe the car THEN is with a wrecker or rollback. Once it's tripped, you will have to know / find the enable switch to trigger the security relay back on. This ground will tie in with a couple of other relays, and will be grounded by the "security" relay, which will be essentially the security system. I ran an extra trigger wire to the rear for the ground side of the pump relay. My Dart, if I ever live long enough, is street. Really you need to sit down and block this out to start, make a simple block of what you want to control and how. This is going to need another trigger wire, which would defeat any "simplification" you had in mind. If not you would I guess have to use the ign switch to trigger one extra relay which would turn on/ off the 12V trigger power to the relays. If you are going to control stuff THROUGH the IGN switch, the easiest would be to control/ trigger the relays in the hot lead. Hopefully someone with more experience than I can chime in and help you out also. It's helpful to draw the schematic so you can keep track of it all. ![]() Just think of it like this, there are many individual circuits in the car. It helps to keep everything in order in your head as you go through laying out each circuit. If you haven't done this before I would suggest making a schematic for yourself. If you have something you're just running power to and grounding the other side, then just put a fuse on the 12v side. So you have a switched ground triggered input, and a 12v input, and then one output to the load. Those are the reasons a relay board is nice. Most of these panels have in-line fuses, though, and that lets you tailor the fuse to the load that should be appropriate for the circuit. The relay also acts as a protection circuit, as it will blow if the load exceeds the relay's rating. If you didn't have a relay back there you'd have to run a 10guage power wire the length of the car, and that wire would have 12v on it the whole time you have the pump on. Example: if you have a fuel pump in the back of the car you can put a relay next to the pump, and run a tiny 20gauge trigger wire all the way up to the switch panel, if you chose to. It also allows you to run much smaller gauge wire from the switch to the relay, because it's a trigger, it doesn't need to be bigger gauge wire designed to carry a load. The entire panel could be grounded with no power. The benefit, in my opinion, of running a negative triggered relay is that you dont have to run power up to a switch panel, or to a single switch. A relay board is used when you're using a switch to power on a load (water pump, fans, etc.).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |