The Stovebolt Site Forums The Parking Lot '60-'66 Trucks Help Alternator and Front Harness Wiring

Hello members,

I have a question regarding the front wiring harness that runs from the driver side firewall to the radiator.

I have a new front harness that has the connection for the alternator, horn relay and voltage regulator.

Link Front Harness:

Front Harness

However, my truck has a LEECE NEVILLE 2500 JB alternator with integrated regulator installed. There is nothing on it except a plus and minus symbol (see pictures).

I'm having a hard time with the alternator wiring and the non-existent voltage regulator. I also don't know how to connect the alternator even with ammeter. Everything was out when I bought it.
Is there any way to bridge this quad connector (see pictures)?
Does that make sense?

Or is it better to buy a new front harness?
Which one comes into consideration for my alternator and the rest?

I would be very happy about tips or great wiring diagrams :-)
Keep the trucks running!

Greetings Brian


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Brian,
I’m not very familiar with alternator wiring and regulators. When I accidentally damaged a regulator in my son’s 1968 C10, I looked at buying a new regulator, I realized that an internally regulated alternator would be the easiest solution. So my new internally regulated alternator was about the same price as a new regulator. It has only one wire from the alternator to the + post on my starter. It makes more amps than my older regulator too.

I can send you pictures of the factory service manual wiring diagrams if that will help. My 1963 truck still has a regulator and factory style alternator but the alternator is different than the one you pictured.

That Leece-Neville is a far better alternator than anything GM has ever built. Just connect the two big terminals in whatever ground polarity you choose to use, and ignore the 4-pin plug that was intended to be used with the early GM "Delcotron" with an external regulator. The L-N will keep the battery (or batteries) charged with no other connections needed.
Jerry

ok, thanks for the tip.
But some things are still unclear.

Connection:

- Minus alternator= frame
- Plus alternator= battery
- there was a second cable on the positive terminal of the alternator before.
where does this go?
Necessary?
- the blue cable (bridge) was before so= I let
- A long cable is connected to the top screw connection (next to minus).
Where does this go?
to the Ammeter?

What do I do with the quad connector for the former regulator?
Bridges?
If so, how?

Thank you very much. Without your help in the forum such a project would not be possible. THANKS

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We don't have enough information to work with. What year and series is the truck you're working with? The wiring harness in your link is designed to fit a light duty truck such as a pickup with an original equipment alternator with an external regulator. That Leece-Neville alternator was usually used on heavy duty rigs such as tractor trailers, fire trucks, ambulances, and other vehicles with a lot more electrical accessories than the average truck. The 4 pin connector does not need any connections at all, since the alternator it was intended to work with is not being used. Please give us enough information to be able to help you.
Jerry

60-66 chevy trucks - wiring diagrams


an article about the original shop manuals for 1960-1966 Chevy trucks


Find a vendor that sells the literature and ships international:

The Chevrolet & GMC Trucks Parts Vendors List



This may or may not help, but one never knows:

1965 Chevrolet C10 — FRONT L...ing to a internally regulated alternator

Great electrical automotive technical articles: ELECTRICAL TECH SECTION

Good luck.

-Woog

Hello to all,

first of all thank you for the info.

The Leece Neville is installed in my Chevrolet C60 Firetruck, year 1965/66.

When I bought the truck, it was in a pathetic condition. I didn't find any wiring harnesses for C60, but according to forum posts, the cab, engine, dashboard are identical in construction to the Chevy C10 from the year of manufacture....

In the truck is a lot of accessories, zusätzlihe lighting equipment. The large alternator is needed.
I'll send you pictures of my wiring harness later. Maybe this will help again.


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I have attached the pictures of the wiring harness.
This is the harness from the firewall through the alternator to the radiator (former voltage regulator) horn relay, low beam.

I don't know exactly where the white and blue wires go to the alternator. the two wires also go to the four way connector from the Voltage Regulator.

Maybe someone knows. I hope the pictures help.

If I don't need them, I'll clamp the alternator as described and try it out.

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We must see ALL numbers on the wires. You have covered up some numbers with your hands. Your pictures are too small to see some numbers. We must be able to match the wire numbers to the list.

You ask about Blue and White. That is no. 9 on the list. You do not use that connector.
The Red with boot is probably No. 10. Your thumb is covering the number. If it is No. 10, it goes to alternator +
The 4 way (No. 7) not used.

You must use the numbers on the wire and match to instruction list. 999= No. 9 on list. 777= No. 7 on list. The supplier was too lazy to cut the marker to just show one 9 or one 7.

I'll be back in the hall tomorrow and then make reasonable pictures, on which the number can be seen. Thanks already.

Greetings Brian

I was typing the answer just now as you posted. I think I answered your questions. Let me know. If there are more pages of instructions, please post them.

Ok, thanks for your/your help.
I will get the complete rewiring done the next few weeks. Then I hope that everything works.

If not, I'll get back to you. You guys are great.

Greetings Brian