| Re: [GMCnet] Isolator -- bypass? [message #326876 is a reply to message #326858] |
Thu, 07 December 2017 21:58   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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I looked at all of the pictures. I still do not see where the alternator wire is coming out of the wiring harness. The alternator wire usually comes out near the top horizontally from the vertical split loom tubing. I'll take your observation and assume The alternator wire is attached correctly.
As far as the isolsator goes I see no advantage in attaching the house and the engine / chassis to the same isolator terminal. I would change it back when you install the new isolator. I would not worry about the 80 amp isolator and 100 amp alternator combination because that is 80 amps per port. That said a 100 or 125 amp isolator is the same price as an 80 so why not go for the heavier one. I saw a 3 battery isolator rated at 125. That might be a good solution if you are buying a new one. You do not have to use the 3rd port now but you could use it in the future.
I'm working on a 78 GMC right now. It needs a new converter. I'm waiting for the owner to get a replacement Progressive Dynamics one. In the interim I attached a 12.5 amp switching type power supply and adjusted it to 13.2 volts. Worked great. Then tonight I disconnected the 120 VAC before disconnecting the 12 volt side. The thing went up in smoke. My whole hangar now smells like an electrical fire. It really smoked.
Good Luck. It sounds like you are on top of your problem(s).
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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