Because I am experiencing low voltage issues when I’m driving at night with the lights, A/C on I’m thinking of going to a 90 amp unit. Horn is weak at these times and, at a traffic light at night, I sometimes get the low amp light on if I’m there for a while. Call me lazy.... but I do get why there were two alternators (60 and 90 amp). It’s just that I don’t know what the difference in installation is all about. So.....I have a question of the body FCBO. I checked the voltage and it it is at 14 so I’m thinking I’m dealing with an amp issue when all the accessories are going. So here’s the question(s): Can I make the switch to the 90? What needs to be changed to do this?