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Wiring, Electrical & Installation
Limit of GM Switched ignition for relays?
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<blockquote data-quote="wew lad" data-source="post: 8567398" data-attributes="member: 665412"><p>Anyone know what the limit of the GM switched ignition relay is? Also curious to know what a simple 5 amp relay draws on the switching terminal coil and if its within the limitations of a switched source</p><p></p><p>I need to tap into it, or another switched 12v source to run in line with a resistor and bulb for an alternator that's not getting the appropriate voltage from the dash L field wire due to it being in parallel with another alternator.</p><p></p><p>If anyone has knowledge of how the electronic dash light works on 99-06 gm full size's I'd really appreciate it. My belief is that the PCM controls it but is limited in its ability to put out enough magnetic field to keep two large case alternators excited vs the oem single stock small case. On occasion the voltage going into the L terminals is nearly 0 causing one or both alternators to shut off until I rev past 5k or buddha blesses me (i.e. idfk)</p><p></p><p>here's the most accurate schematic so far:</p><p></p><p><img src="http://67-72chevytrucks.com/vboard/attachment.php?attachmentid=1012345&amp;d=1352914209" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>and this one is from a 03-07classic with the newer pcm controls for voltage sensing. easier to read, just ignore the C terminal field generator duty cycle</p><p></p><p><img src="https://www.performancetrucks.net/forums/attachments/gm-engine-exhaust-performance-21/14502d1095566102-2002-alternator-wiring-schematic-776448.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="wew lad, post: 8567398, member: 665412"] Anyone know what the limit of the GM switched ignition relay is? Also curious to know what a simple 5 amp relay draws on the switching terminal coil and if its within the limitations of a switched source I need to tap into it, or another switched 12v source to run in line with a resistor and bulb for an alternator that's not getting the appropriate voltage from the dash L field wire due to it being in parallel with another alternator. If anyone has knowledge of how the electronic dash light works on 99-06 gm full size's I'd really appreciate it. My belief is that the PCM controls it but is limited in its ability to put out enough magnetic field to keep two large case alternators excited vs the oem single stock small case. On occasion the voltage going into the L terminals is nearly 0 causing one or both alternators to shut off until I rev past 5k or buddha blesses me (i.e. idfk) here's the most accurate schematic so far: [IMG]http://67-72chevytrucks.com/vboard/attachment.php?attachmentid=1012345&d=1352914209[/IMG] and this one is from a 03-07classic with the newer pcm controls for voltage sensing. easier to read, just ignore the C terminal field generator duty cycle [IMG]https://www.performancetrucks.net/forums/attachments/gm-engine-exhaust-performance-21/14502d1095566102-2002-alternator-wiring-schematic-776448.gif[/IMG] [/QUOTE]
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Limit of GM Switched ignition for relays?
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