| As Nelly says check the two yellow wires futher back, on my 748 I spent a bit of time choping the bullet connectors off the wiring from the engine and replacing them as well as replacing the two yellow wires that run between them and the plastic block connector that connects them to the reg/rec.
Also consider replacing the fuel filter if it hasn't been done for a while, as when it starts to block up it loads the fuel pump more which then draws more current and with the single phase alternator models their is only so much current to go around. |