Check all the power/ground wires that run from battery, fusebox, alternator to chassis/frame, starter, etc.
On the W-body's, we made a point to upgrade/supplement all major wires and ensure clean contacts... Running a fresh 4ga battery wire (sold in stores for ~$7-10) from Alt to fusebox, engine to strut tower, battery negative to frame, and sometimes a fresh positive to starter. The H's may have 1-2 different wires that could also benefit from upgrading, due to different positioning of components.
On the W-body's, we made a point to upgrade/supplement all major wires and ensure clean contacts... Running a fresh 4ga battery wire (sold in stores for ~$7-10) from Alt to fusebox, engine to strut tower, battery negative to frame, and sometimes a fresh positive to starter. The H's may have 1-2 different wires that could also benefit from upgrading, due to different positioning of components.
