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Author
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Topic: Electrically noisy alternator??
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-17-2004 04:49 PM
   
I've got an alternator that interferes with the MSD digital 6+. I've isolated the distributor's pickup wires and grounded everything including heads to block to body to msd to regulator to battery. Even wrapped the pick-up wires with a ground. The alternator still causes the ignition to miss and cut out. I disconnect the alternator field wire and it runs perfect! Witch would you guys change first, the alternator or the electronic regulator? Is there a way to test for EMI output? Thanks,SteveW
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-17-2004 05:26 PM
Is it a Mopar double field alternator?------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-17-2004 06:18 PM
Yep on the Mope, not sure how many fields. Mid 70's vintage.  SteveW
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-17-2004 08:48 PM
1970 and up Mopar went to double field alternators.
Are they both hooked up?
They will be marked on the case at the spade terminals.
They will work with only one of the fields operative with a minor re-wire job.
------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-17-2004 10:25 PM
Alex,There are two spade terminals on the alternator and both are hooked up to the regulator. One orange wire and one blue if I remember correctly. Then the large output wire goes to the batt in the trunk. It worked fine for a year, but now??? Maybe I should just switch it for a Delco or a mini alternator? SteveW
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-18-2004 11:00 AM
The changeover to the double field alternator coincided with the introduction of the electronic voltage regulator.
I believe that you may just have a faulty regulator Steve.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-18-2004 11:29 AM
Thanks Alex,I'll try that first since it is old and probably cheaper too. LOL SteveW [This message has been edited by steve'66 (edited 10-18-2004).]
IP: Logged |
chip67
Gearhead Posts: 245
From: louisville, ky, jefferson
Registered: Oct 2004
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posted 10-18-2004 02:18 PM
now alex is reading minds. you guys crack me up.------------------
coupe, 306, 4 speed, 4.11's. pump gas, n/a street car. best so far is 7.50 (1/8 mile) at 92mph with 1.63 60ft. time.
IP: Logged |
steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-18-2004 02:42 PM
Chip,He is goood...  SteveW
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-18-2004 08:47 PM
New regulator and same thing....  Could the MSD's EMI suppresion circuits have failed? SteveW
IP: Logged |
Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-19-2004 11:24 AM
Doubtful Steve.
Have you tried pulling the plug on one of the field terminals?------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-19-2004 12:37 PM
Alex,Yes, pulling just one field wire fixes the ignition problem. What does that mean? SteveW
IP: Logged |
Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-19-2004 03:29 PM
Feedback from the alternator back to the MSD box.
Need a new power source for the MSD box that is nor powered up by the alternator harness.
You can keep your Mopar alternator..------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 10-19-2004 04:24 PM
Alex are there any makes of cars you don't know everything about ?
That was real impressive! ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-19-2004 05:36 PM
How about a good filter for a stero system?Can the power to the regulator come from the alternators output wire that goes to the trunk mtd. battery? It is switched off when the car isn't being used. If so then I can move the regulator to the other side of the engine compartment and out of the wiring harness completely. SteveW
IP: Logged |
Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-19-2004 06:19 PM
I'm not a fan of electronic filters for ignition cures.I like the other option. ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-31-2004 12:30 AM
Update,I fixed it, but not sure how.... LOL I isolated the regulator, no change.
Bought a new alternator and found a diode missing from the old one. This had to be it. But, it wasn't! Still screwed up with the alternator charging even though it was "excited" from the output lead to the battery in the trunk. So, I gave up and installed a toggle switch in the dash to excite the alternator. That way I can have it running cleanly thru the 1/4 and charge on the return road. Got it all wired up and now,,,, It runs great with the switch on and the alternator charging, and crappy with the switch off. I don't get it, but I'm not complaining! Don't you have a love/hate relationship with something that you fix, but don't know why?  SteveW
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