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Alternator wiring / seloniod / MSD box
#1
What is the proper wiring for the alternator harness as far as the ground goes. Where did Ford originally place it? I grounded mine to the negative side of the selonoid (where the starter wire goes) but i was thinking what happens if i crank the motor over? Wouldnt that terminal supply 12 volts to it.

I currently have my MSD Digital Box, Alternator Harness, Electric Fan, and Starter Cable mounted to this post. I never had the car started yet, not ready. I have turned the key and had heard the selonoid ringing the way its supposed to. No burned wires.

So before i do anything lets hear some suggestions.
What is the proper and correct way to wire and ground placement. Especially for the alternator wire.
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#2
No post on the selonoid are grounds.

72 Q Code Mach 1, 351C, Toploader.
69 Torino GT Convertible, 351W, FMX
03 Anniversary Harley Davidson
31 Deluxe Tudor
91 F350 Lariet Crewcab 4x4, 460, automatic
2012 Escape 4x4
92 Feature Edition Mustang
82 F100 Shortbed
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#3
The negative cable from the battery is grounded in two locations if you have an original style cable. If you do, there is a small metal tab crimped to the cable about 1/3 of the way down the cable. It attaches to the bottom screw of the regulator using a toothed washer. The end of the cable attaches to a threaded hole at the front right corner of the block with a bolt and a toothed washer. This is the location I used to ground the MSD 6AL. Is the alternator wire you are referring to an 8 gauge black wire with an orange stripe? Does the car have factory gauges? If so the wire attaches to a single post terminal block about 1 inch forward of the regulator. Exactly how all the wiring is routed and attached varies with year, date of production, and options such as convenience group, heated rear glass, gauges, and convertible top. Have you looked at the wiring diagram on this site? Good Luck, Chuck
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#4
Ya its kinda hard for me to read. No the ground wire from the alternator is pretty thin no other markings. I dont have the style battery cable you do. I have all reproduction wiring for alternator and battery. 73 Mach 1, have gaigrs but not hooked up. My car didnt come with them. Originally. I believe i do have convience package.
The concouse style bat cables i got come with the pos neg and starter cable
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#5
The solenoid is grounded to the body by it's screws. As oldmountainfarm pointed out there is no ground wire going to it. If you can, how about posting a picture of what you have. REMEMBER!!!! DO NOT CONNECT THE NEGATIVE OF THE BATTERY UNTIL YOU VERIFY WITH A TESTER THAT THERE IS NO VOLTAGE!!!! or have an extinguisher at the ready.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#6
markmel;41684 Wrote:REMEMBER!!!! DO NOT CONNECT THE NEGATIVE OF THE BATTERY UNTIL YOU VERIFY WITH A TESTER THAT THERE IS NO VOLTAGE!!!! or have an extinguisher at the ready.

YEP, Great Advice.

mike

[Image: 1_11_11_13_11_50_27.png]
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#7
mikepasquale1;41679 Wrote:Ya its kinda hard for me to read. No the ground wire from the alternator is pretty thin no other markings. I dont have the style battery cable you do. I have all reproduction wiring for alternator and battery. 73 Mach 1, have gaigrs but not hooked up. My car didnt come with them. Originally. I believe i do have convience package.
The concouse style bat cables i got come with the pos neg and starter cable
The alternator grounds when it is bolted to the block. The alt. should have 3 wires, Black with orange stripe, White with black stripe, and Orange with a light blue stripe. At the regulator, depending on the harness you have, Orange/light blue stripe, Light green/red, and Yellow with white dashed line. There are at least two or three different configurations for 1973. Any part numbers on the packages? If the battery cables are concours the negative cable should have the ground tab and be marked Motorcraft ( not Autolite). Pictures of the harness would help. Chuck
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#8
Well doesnt the neg battery cable go in the post on the right? With the battery hooked up, the ground wire coming off of my alternator harness when i put it on this post, it completes the circuit allowing power to the rest of the car, When i did this the wipers, lights, anything in the on position turned on.

markmel;41684 Wrote:The solenoid is grounded to the body by it's screws. As oldmountainfarm pointed out there is no ground wire going to it. If you can, how about posting a picture of what you have. REMEMBER!!!! DO NOT CONNECT THE NEGATIVE OF THE BATTERY UNTIL YOU VERIFY WITH A TESTER THAT THERE IS NO VOLTAGE!!!! or have an extinguisher at the ready.



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#9
Do you mean alternator bracket? Not the alternator electrical connections.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
  Reply
#10
No not the bracket. I have a ground wire coming off of the alternator harness that plugs into the voltage regulator. Ill provide pics asap
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