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Old 08-01-2012, 10:09 AM
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1973 Nova Engine Bay Wiring Question

Hey guys, I've gotten to the final stages of the 1973 Nova and I'm having a hard time trying to find a wiring diagram online. It seems like Google and Bing are only interested in advertising rather than providing information.

Anyways I figure that the system is fairly simple, an alternator, battery, coil and starter. The alternator was simple, the wiring connectors made that easy to tell where they went. The distributor has a black wire that goes to the negative side of the coil. The positive side has a black wire from the junction block that's spliced into a yellow wire, which I've been told goes to the starter.

As for the starter I'm confused, I'm used to Ford's set up so it confuses me not to see a starer solenoid. But a friend told me that the solenoid is actually on the starter.

So how would I connect the battery to all of this? How does the Alternator charge the battery in the circuit? I just need a wiring schematic and I think I can take it from there.
Thanks guys

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Old 08-01-2012, 10:30 AM
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Several color Diagrams here:
73 nova wiring diagram - Google Search

This one's good:
http://media.photobucket.com/image/7...II/wiremap.jpg

Last edited by SSedan64; 08-01-2012 at 10:40 AM.
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Old 08-01-2012, 11:40 AM
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thx man, I noticed that one of the wires goes from the Horn relay to the Battery. It seems like thats the source of charge for the Battery from the Alternator. thanks again
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Old 08-01-2012, 07:15 PM
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The horn relay is used as a junction only for externally regulated alternators. If you have a 10si or 12si with internal regulator, the horn relay only activates the horn (as in most modern cars). I would expect a '73 to have an internally regulated 10si alternator.

Bruce
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Old 08-02-2012, 09:01 PM
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Check out the Doc Vette thread on this. With the early 63 amp?) alternators, the horn relay was used for a junction on some vehicles.
PatM
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Old 08-09-2012, 02:41 PM
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okay I'm really confused guys. I have an internally regulated alternator and it still has the old hook up to the horn relay. How do I hook up a internally regulated alternator to the battery? DO I have to bypass that and go straight to the battery?

also it appears that my starter solenoid only has one hook up for the positive batter cable, one for the coil wire and the other is the power to the starter. I dont see one for the purple wire, is there another way to hook that up too?

Last edited by 67MercCat; 08-09-2012 at 02:50 PM.
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Old 08-11-2012, 04:58 AM
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May help > Catalog

http://www.madelectrical.com/electrical-tech.shtml
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Old 08-11-2012, 04:12 PM
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The OEM purple wire goes to the "S" terminal on the starter. Here is Doc's dia on the old external to new internal.

You can hook the lg lug and the rear of the alt to the pos lug on the starter (the pos battery cable). or as in my case, before the re-wire, I ran it to the original fusable link that's located in the factory splice by the horn relay (fusable link was orange).

I got tired of all the old to new jumping etc..... and rewired the whole car. Now, my lg lug from the alt runs into a main splice, along with all the other positive leads to the fusebox, all the pos wires run into one side of a 70 amp MAxi-fuse and the other side is connected directly to the battery via a 10 inch piece of 8 guage wire
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Old 08-14-2012, 06:17 PM
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thx for the help fellas, I got it started and running sweet, alternator is charging and distributor/coil is firing. When I put the trans fluid in though, it started to make a horrible ringing noise. With further investigation I realized that the flywheel is rubbing the starter gear, but thats a topic for another section.

thanks for all the help!
Tony
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Old 08-14-2012, 08:37 PM
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Heres a pic...
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