Alternator installation

BILLFSHR

MEMBER
1990 FORD F-250
5.8L
V8
4WD
AUTOMATIC
100,000 MILES

I have a new alternator to install, it has one small white wire two larger black wires, and one plug in, the black wires are the same. On my truck I have two black wires with white stripes, which black goes where or does it matter?

Sunday, November 21st, 2021 AT 3:02 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

I'm looking through the schematics and I show two different designs. One has an internal voltage regulator, and one is external. Looking at both schematics, I'm seeing white wires with a black tracer. Is that what you have?

Do me a favor. Take a look at the schematic below. It contains both types of systems. See if one mirrors what you have.

Let me know if this helps or if you have questions.

Take care,

Joe

See pics below. Note: I had to cut the schematic in half to make it readable. However, I did overlap them so you can follow from one to the next.

Images (Click to make bigger)

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Sunday, November 21st, 2021 AT 9:56 PM

BILLFSHR

MEMBER
9 POSTS

No neither are right, I found a phone number for the place that rebuilds these alternators, the two black wires both go to positive battery. So, they can go together either way, so question answered, thanks for the help!

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Monday, November 22nd, 2021 AT 1:05 PM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

First, thanks for the update. I'm surprised that isn't identified in the manual, but anything is possible. LOL

Regardless, take care of yourself, and feel free to come back anytime in the future.

Joe

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Monday, November 22nd, 2021 AT 7:50 PM