Alt Wires On A 79

79dog

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May 15, 2013

#1

• May 15, 2013

• #1

Hello again, coming off the alt is a 3 plug connection. That plugs into a connection coming off the harness around the voltage reg. That connection has broke on my car. All I see are two wires. I figure the black goes in the top center hole but I can't figure which side the other wire goes. And was there a 3rd wire somewhere? Any pics or info is welcome. Thx...

 

jrichker

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May 15, 2013

#2

• May 15, 2013

• #2

See if this helps....

 

79dog

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#3

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I'm just using a stock 79 alt. I have a sta, fld bat and grd. Which has me wondering, theres nothing hooked to the ground.

 

jrichker

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May 16, 2013

#4

• May 16, 2013

• #4

79dog said:

I'm just using a stock 79 alt. I have a sta, fld bat and grd. Which has me wondering, theres nothing hooked to the ground.

Click to expand...

Alternator ground is usually through the alternator frame. Be sure that the engine to body ground on the back of the intake manifold to the body is in good condition.

 

RsStanG1987

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May 16, 2013

#5

• May 16, 2013

• #5

I have the alt from my 83 I can look at..


Yellow Bear racing 2k13

 

79dog

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May 18, 2013

#6

• May 18, 2013

• #6

ok, tomorrow I'm hooking up all the grounds and see what happens.

 

79dog

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May 19, 2013

#7

• May 19, 2013

• #7

Well, here's an update. The Alt bracket on my 79 is not steel. At least a magnet don't stick to it. So, I guess I need to run to the parts store and get some connections to hook the Alt ground up.

 

jrichker

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May 19, 2013

#8

• May 19, 2013

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If it is aluminum, that's better that steel. They use aluminum wire for mains in most houses nowdays.
I have never seen a plastic alternator mount on any Mustang, so an extra ground wire shouldn't be needed.

 

79dog

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May 22, 2013

#9

• May 22, 2013

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update, did you know it helps to have the dash cluster hooked up?

 

jrichker

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May 22, 2013

#10

• May 22, 2013

• #10

The 87-93 Mustangs have a 500 ohm resistor in parallel with the Alt warning light. It connects with the Green wire on the alternator. It serves to tell the voltage regulator to turn on when the ignition switch is in the Run position. Your car may have a similar arrangement.