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eld byoass not working
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<blockquote data-quote="keep_hope_alive" data-source="post: 7827275" data-attributes="member: 576029"><p>how are you monitoring the work you did? did you measure the voltage seen by the ECM both before and after the mod? how are you observing the status of the alternator?</p><p></p><p>the ECM will tell the alt to turn off when several circumstances present themselves. typically while driving, not while parked, not when the battery voltage is already low, not when the ECM sees more than a certain voltage across the ELD. For me, it was around 2.2VDC across the ELD when the alt would come back on. I verified this by turning on all ignition loads on the load side of the ELD (by referring to the Service Manual schematic) - but the biggest load is the A/C and radio. With the A/C and radio on, i saw around 2.2VDC, so I used the resistor to achieve 1.8VDC. it is important to keep in mind that you're tying the resistor to the ELD ground, not chassis ground. voltage is relative. with an open circuit, the ECM should give 5VDC to the ELD. current through the ELD increases resistance and causes the voltage across the ELD to decrease.</p><p></p><p>i used the relay to bypass the factory ELD in place of a resistor. my head unit remote output provides +12VDC to the relay coil, and a switch connects the other side of the relay coil to ground.</p><p></p><p>you need to make sure the 5-pin relay you are using has a true N.O. and N.C. contact. I've seen some 5-pin relays with two N.O. contacts tied in parallel. The only way to be sure, is use your DMM.</p><p></p><p>Over the years, i've done a lot of wiring projects. i'll usually draw out a circuit when attempting something for the first time. I've thought I had things perfect, but it didn't work. that is the point where you draw out what you did (while looking at it - don't try to copy the diagram, just draw how you did it). then measure voltage at nodes and compare with what you expect to see. typically, while drawing it out, you find the problem and feel like an idiot. i know. i've been there.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7827275, member: 576029"] how are you monitoring the work you did? did you measure the voltage seen by the ECM both before and after the mod? how are you observing the status of the alternator? the ECM will tell the alt to turn off when several circumstances present themselves. typically while driving, not while parked, not when the battery voltage is already low, not when the ECM sees more than a certain voltage across the ELD. For me, it was around 2.2VDC across the ELD when the alt would come back on. I verified this by turning on all ignition loads on the load side of the ELD (by referring to the Service Manual schematic) - but the biggest load is the A/C and radio. With the A/C and radio on, i saw around 2.2VDC, so I used the resistor to achieve 1.8VDC. it is important to keep in mind that you're tying the resistor to the ELD ground, not chassis ground. voltage is relative. with an open circuit, the ECM should give 5VDC to the ELD. current through the ELD increases resistance and causes the voltage across the ELD to decrease. i used the relay to bypass the factory ELD in place of a resistor. my head unit remote output provides +12VDC to the relay coil, and a switch connects the other side of the relay coil to ground. you need to make sure the 5-pin relay you are using has a true N.O. and N.C. contact. I've seen some 5-pin relays with two N.O. contacts tied in parallel. The only way to be sure, is use your DMM. Over the years, i've done a lot of wiring projects. i'll usually draw out a circuit when attempting something for the first time. I've thought I had things perfect, but it didn't work. that is the point where you draw out what you did (while looking at it - don't try to copy the diagram, just draw how you did it). then measure voltage at nodes and compare with what you expect to see. typically, while drawing it out, you find the problem and feel like an idiot. i know. i've been there. [/QUOTE]
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eld byoass not working
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