MR2 Alternator Upgrade?

General discussion about our beloved Tercel 4WD cars
User avatar
BaileySims
Highest Ranking Member
Posts: 588
Joined: Sat Aug 30, 2014 6:52 pm
My tercel:: 1983 Tercel SR5 4WD
Location: Texas
Contact:

Re: MR2 Alternator Upgrade?

Post by BaileySims » Tue Oct 11, 2016 6:57 pm

For those of you who upgraded the alternator, how exactly are you modding the upper bracket to get the belt to tension up on it?
WAGON MAFIA.
Blood, sweat and beers.

User avatar
Abletobecain
Top Notch Member
Posts: 413
Joined: Sun Dec 09, 2018 9:18 am
My tercel:: 1983 4WD DLX, 1986 4WD SR5, 1985 4WD SR5, 1983 4WD SR5
Location: Kitsap County
Contact:

Re: MR2 Alternator Upgrade?

Post by Abletobecain » Mon Jan 06, 2020 3:29 pm

Bump. Fresh pics of that GM set up would be great! Damn Photobucket concealed all the images.
1977 BMW R100S 1WD ("Brunhilda"/Summer Fun)
2007 Tundra Limited Crewmax 4x4 ("Tetsuo Shima"/Hauler) SOLD :cry:
1983 DLX Tercel Wagon 4WD ("Charlie"/Daily Driver)
1987 SR5 Tercel Wagon 4WD ("Sprocket"/Off-road-Camping)
1985 SR5 Tercel Wagon 4WD ("Lucky"/Project)
1983 SR5 Tercel Wagon 4WD ("Cadaver"/Parts Car)
1987 DLX Tercel Wagon 4WD ("Lil Red") SOLD :)

User avatar
Abletobecain
Top Notch Member
Posts: 413
Joined: Sun Dec 09, 2018 9:18 am
My tercel:: 1983 4WD DLX, 1986 4WD SR5, 1985 4WD SR5, 1983 4WD SR5
Location: Kitsap County
Contact:

Re: MR2 Alternator Upgrade?

Post by Abletobecain » Mon Jan 06, 2020 3:31 pm

I'm also curious if there's anything else you need to do when upgrading the alternator...like to the wiring or whatever?
1977 BMW R100S 1WD ("Brunhilda"/Summer Fun)
2007 Tundra Limited Crewmax 4x4 ("Tetsuo Shima"/Hauler) SOLD :cry:
1983 DLX Tercel Wagon 4WD ("Charlie"/Daily Driver)
1987 SR5 Tercel Wagon 4WD ("Sprocket"/Off-road-Camping)
1985 SR5 Tercel Wagon 4WD ("Lucky"/Project)
1983 SR5 Tercel Wagon 4WD ("Cadaver"/Parts Car)
1987 DLX Tercel Wagon 4WD ("Lil Red") SOLD :)

The Professor
Highest Ranking Member
Posts: 586
Joined: Wed May 12, 2010 6:38 pm
My tercel:: 1987 Tercel SR5 4WD wagon
Location: Western Washington
Contact:

Re: MR2 Alternator Upgrade?

Post by The Professor » Tue Jan 07, 2020 8:13 am

Abletobecain wrote:
Mon Jan 06, 2020 3:31 pm
I'm also curious if there's anything else you need to do when upgrading the alternator...like to the wiring or whatever?
It wouldn't hurt to run new cables, considering they're underbuilt and 30+ years old...
1975 Subaru SuperStar wagon
1984 Subaru Turbo-Traction wagon & Turbo-Traction hardtop
1987 Subaru RX 3-door, x2
1987 Subaru RX Type-RA 3-door
1987 Toyota Tercel SR5 wagon
1999 Subaru Forester S
2002 Subaru WRX sedan
2019 Subaru Outback 2.5i Limited

User avatar
MrWrench
Top Notch Member
Posts: 108
Joined: Sun Feb 03, 2019 9:10 pm
My tercel:: 1985 Tercel SR5. aka Spud
Location: Michigan

Re: MR2 Alternator Upgrade?

Post by MrWrench » Sun May 31, 2020 8:53 pm

Reviving this thread. I am heading out on a 3,000 mile road trip soon and would like to upgrade my alternator beforehand. I have a reman 60 amp that runs at 14.4 volts almost always. But when I have the radiator fan on, the blower motor, radio, recently installed electronic fuel pump and the headlights on, the voltage drops below 12.4ish and the fuel pump will kick and die.
I'll likely have up to 3 phones charging and possibly a flashlight via the cigarette outlet too during the trip so having a 100 amp MR2 alternator would be amazing!
Has anybody made an MR2 alternator fit?

I'm wondering if I replaced the wiring with a thicker gauge wire if it would help?
Thanks in advance!
1984 Toyota Tercel SR5 winter driver rescue
1985 Toyota Tercel SR5. Daily driver. Aka "Spud"
1986 Toyota Tercel SR5. - Recent wagon rescue/project.
* ISO - any 4wd manual transmissions *

User avatar
NWMO
Highest Ranking Member
Posts: 924
Joined: Wed May 20, 2015 1:08 pm

Re: MR2 Alternator Upgrade?

Post by NWMO » Mon Jun 01, 2020 12:36 pm

Good afternoon Luke,

I have replacement EU headlamps to install and some have struggled getting them wired w/o difficulties. I know with the undersized stock wires, voltage drop can become an issue. The common workaround is to use the existing "headlight" wire to "switch" a solenoid that has a larger wire providing battery voltage direct from the battery or ALT. This would help some, but you may also need a larger alternator and associated wiring due to additional electrical loads.

Chris
Psalm 37:4 "Delight yourself in the Lord and he will give you the desires of your heart"

In remembrance of my friend ARCHINSTL:

T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"

"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain

Post Reply