Alternator Question - need answer FAST!
Senior User
Joined: Feb 2001
Posts: 119
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From: Dryden Canada
Alternator Question - need answer FAST!
After a reasonably long road run tonight I stopped for supper with my wife and came back to a truck that wouldn't turn over ... apparently not enough juice left in the battery. Looks to me like an alternator, but I could be wrong. My question is, will the alternator from an 85 5.0l V8 fit on my 84 4.9L I6? I need to know ASAP! Thanks in advance for any help ... this board has always rocked.
Chris.
Chris.
Senior User
Joined: Dec 2001
Posts: 340
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Alternator Question - need answer FAST!
Quick answer, I'd bet not. There's so many variations of where it mounts and where the brackets are, I'd bet it won't work. Output wise (amp output) it would be OK, its bolting it in that may be a problem.
Best bet - Autozone, runs about $79 with a lifetime warranty. I'm on my 3rd alternator.
Best bet - Autozone, runs about $79 with a lifetime warranty. I'm on my 3rd alternator.
Senior User
Joined: Feb 2001
Posts: 119
Likes: 0
From: Dryden Canada
Alternator Question - need answer FAST!
Well, new is probably where I'm going, but I want to exercise all of my cost-free or low-cost methods first. Some days I think the truck needs to go up in flames or off a cliff or something fun. 
Chris Pollard
Dryden, ON
Don't mind me, I'm crazy.
:-X11
Chris Pollard
Dryden, ON
Don't mind me, I'm crazy.
:-X11
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
Alternator Question - need answer FAST!
It will likley fit the brackets, but, the 84's run an external voltage regulator, while some of the late 85's run an internal regulator alt. If it's an external regulator alt, it's a direct bolt in, if it's an internal reg alt you'll need to do some re-wiring to make it work.
1982 F100 SWB
351w HO, 9.5:1 compression
4bbl, Hedman Hedders
Purple Hornie header mufflers
NP 435/2.75 geared 9"
1985 F150 HD, 300 HD/needs a NP 435/4.10 geared 8.8
70,000 miles
1980 F100 Custom, 300/Np 435/2.75
1982 F100 SWB
351w HO, 9.5:1 compression
4bbl, Hedman Hedders
Purple Hornie header mufflers
NP 435/2.75 geared 9"
1985 F150 HD, 300 HD/needs a NP 435/4.10 geared 8.8
70,000 miles
1980 F100 Custom, 300/Np 435/2.75
Senior User
Joined: Feb 2001
Posts: 119
Likes: 0
From: Dryden Canada
Alternator Question - need answer FAST!
I may be in luck then ... when I went to start the 85 when I bought it, I had to install the solenoid and voltage regulator from the 84 first! Could be my lucky day.
Chris Pollard
Dryden, ON
Don't mind me, I'm crazy.
:-X11
Chris Pollard
Dryden, ON
Don't mind me, I'm crazy.
:-X11
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
Alternator Question - need answer FAST!
Chris, just noticed that you're in Dryden. I'm movin to Sioux Lookout come July. I thought I saw a few fellow FTE'rs who were from that area.
1982 F100 SWB
300 HD: Cliffy 290H, 9.1:1 compression, forged everything, ARP'd bottom end/Hedman hedder/dual 2½" exhaust
NP 435/2.75 geared 9"
1985 F150 HD, 300 HD/needs a NP 435/4.10 geared 8.8
70,000 miles
1980 F100 Custom, 300/Np 435/2.75
1982 F100 SWB
300 HD: Cliffy 290H, 9.1:1 compression, forged everything, ARP'd bottom end/Hedman hedder/dual 2½" exhaust
NP 435/2.75 geared 9"
1985 F150 HD, 300 HD/needs a NP 435/4.10 geared 8.8
70,000 miles
1980 F100 Custom, 300/Np 435/2.75
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