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#2
07-12-2007, 08:27 PM
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Your charging system is what's called a feedback control system. The regulator drives the alt, then measures the output volatge and readjusts the control (field) to keep the output at a set value. A prob with the reg will casue the alt to act funny, which will make the reg act funny, etc.
Since your regulator is new, a possible problem is that the regulator body has a poor ground to the firewall, or the firewall is not connected well to the battery negative. The reg measures the voltage between it's term #3 and ground so a bad ground will cause a sensing prob. Other possible probs could be a bad stator winding causing a low voltage on regt term 2. Also check for poor connections on the wiring between the alt and reg. Most likely it's a ground issue. If it's still a problem, a simple permanent solution is to replace the alt/reg with a 10SI from a '73 and up GM. It has a internal reg and the install is simple. George
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