MR2 Alternator Upgrade?

[BaileySims]

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?

[Abletobecain]

Bump. Fresh pics of that GM set up would be great! Damn Photobucket concealed all the images.

[Abletobecain]

I'm also curious if there's anything else you need to do when upgrading the alternator...like to the wiring or whatever?

[The Professor]

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...

[MrWrench]

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!

[NWMO]

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