Oregontrav Posted February 7, 2020 Share Posted February 7, 2020 I have an 89 comanche and I'm considering and alt swap because of the power drain when i have the heater on and blinker probly just gonna putt the 100 amp in is there porblems with going up if not can i go to 140 or 200 Link to comment Share on other sites More sharing options...
Eagle Posted February 7, 2020 Share Posted February 7, 2020 The '89 used a GM CS-130 alternator. Those came in two or three different physical case sizes. I found out the hard way when I had my alternator rebuilt for my '87. I wanted to upgrade from an 85-amp to a higher output, and the guy found that the higher output requires a larger case. I was committed at that point, so I went ahead. If I had it to do over, I would go to AutoZone and get one of their new-manufacture Gold alternators and have a lifetime warranty on it. You should have no problem going from a 100-amp to a 120-amp. I don't think you can go higher than that due to space limitations. Keep in mind that in 1989 the 100-amp was the high-output option. If yours can't handle the heater and the turn signals, either your alternator is failing or you have other electrical problems. Link to comment Share on other sites More sharing options...
omega_rugal Posted February 7, 2020 Share Posted February 7, 2020 i would check that alternator first... Link to comment Share on other sites More sharing options...
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