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New Wiring Harness (MSD) |
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Trans Canada 
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Joined: Mar/23/2015 Location: Dorchester Status: Offline Points: 180 |
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 Topic: New Wiring Harness (MSD)Posted: Jun/29/2015 at 8:46am |
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Last year took my car to Kenosha...when I arrived I had a problem with the car running.it started up and sound like it was running on 3 cylinders......I played around with a couple things ended up going from Battery 12volt to my coil 12 plus side.....ran good after that! after the weekend took the car home played around with it,Decide just to pick up a new reproduction harness by M&H.(matched up perfectly)
Finished up just the other day and turn it over........ right back to running like crap......jump the coil runs great......is this have anything to do with the resistor wire to the MSD #8523 ready to run? |
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tsanchez
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Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303 |
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Posted: Jun/29/2015 at 11:06am |
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Needs full 12 volts to module
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DesertAMX
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Joined: Aug/10/2010 Location: Arizona Status: Offline Points: 104 |
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Posted: Jun/29/2015 at 12:27pm |
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On my AMX 390, I used the resistor wire to drive a 12V relay to provide a solid 12V battery power to the MSD ready to run.
Edited by DesertAMX - Jun/29/2015 at 12:30pm |
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needafasterAMX
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Joined: Feb/20/2008 Location: TLH,Florida Status: Offline Points: 724 |
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Posted: Jun/29/2015 at 3:59pm |
Same here |
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74 AMX, 401
Viper spec T56 6 speed trans Hydroboost brakes with rear disks from a Avenger 3:73 TG rear,now Trutrac with 3:15 A Turbo is in my future. |
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Trans Canada
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Joined: Mar/23/2015 Location: Dorchester Status: Offline Points: 180 |
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Posted: Jun/30/2015 at 8:15am |
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Okay....so the resistor wire to trigger the coil of relay.......then the switch part to send a full 12 volts to from the battery to the coil +
well will do that to night!...........please if I'm wrong above please let me know but this makes sense Thanks |
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Trans Canada
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Joined: Mar/23/2015 Location: Dorchester Status: Offline Points: 180 |
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Posted: Jul/02/2015 at 12:47pm |
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Okay I add the relay.....Yellow (RES)wire to the relay coil to trigger it ....then 12 volt from the battery to the M.S.D coil +
car now starts great......now the fun part....... turn the car off....still runs like you never turn it off.....so I pull the wire off battery plus or feed to the coil thru the relay ....car shuts down. at this point took my meter and did a ring test or continuity test .....switch works perfect when you turn the key on and off...........am I getting a back feed thats the only thing that I can think of thats hold relay I do have a glow on my alternator indicator light on the dash.....Alternator is a (Motorola) I was planning on bring the car to Cleveland but at this point the Gremlin X... Is going to get the call! |
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FuzzFace2
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Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10356 |
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Posted: Jul/02/2015 at 4:19pm |
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Just a guess but sounds like the relay is not wired right.
Maybe post up what wire you have on what number post of the relay. Should have 4 wires. Tiger wire (yellow) Ground wire 12 volt wire power wire to MSD Dave ---- |
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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69AMX364
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Joined: Jun/07/2009 Location: Dallas, TX Status: Offline Points: 150 |
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Posted: Jul/02/2015 at 4:25pm |
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If you are use the multi-spark your alternator is back feeding the ignition. When I hooked up the electric choke to that circuit it would turn off with the key. My guess is enough of a draw to stop the back feed.
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needafasterAMX
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Joined: Feb/20/2008 Location: TLH,Florida Status: Offline Points: 724 |
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Posted: Jul/02/2015 at 6:00pm |
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You have to use the diode that came with the MSD and put it in line with the alt charge light.There is enough juice from that circuit to make it keep running. Look at the MSD wiring charts.
Look here http://www.msdignition.com/page.aspx?id=3296 Edited by needafasterAMX - Jul/02/2015 at 6:06pm |
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74 AMX, 401
Viper spec T56 6 speed trans Hydroboost brakes with rear disks from a Avenger 3:73 TG rear,now Trutrac with 3:15 A Turbo is in my future. |
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Trans Canada
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Joined: Mar/23/2015 Location: Dorchester Status: Offline Points: 180 |
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Posted: Jul/06/2015 at 12:43pm |
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Okay I will put the Diode in tonight .... Early question was how I had it wired
Relay #85 Ground #86 Yellow from my key switch #30 12volt from the battery #87 to Blaster coil + BOSCH RELAY |
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DesertAMX wrote: