GMC Motorhome Electrical

This list of downloadable files and/or links is compiled as a service to the GMC Community. Accuracy is not guaranteed. Independent verification is urged. In addition, links are tested periodically but items/sites may have moved or dissolved.

Thank you, to the contributors that took the time to scan and/or share these items. When available, contribution credits are listed. We welcome all historical and technical information related to the GMC Motorhome.

Please submit changes, alterations or additional items you would like to share to . Thank you!


1977 Coachmen 26 Rear Bath Electrical  & Plumbing Drawings (Source/Scan: Emery Stora)

Battery Charger (Source/Scan: Emery Stora)

Lightbulb Usage (Source: X001 Bulletin Book | Pdf: Emery Stora)

Living on 12v (Source: Henry Davis Handout at 2001 GMCWS Rally | Link: GMC Western States)


>> Cruise Control

Cruise Control Resume Conversion

Rostra Early 10 Pin Switch Settings

Rostra Signal Generator 251-4153

Rostra Ultra Cruisell – Duane Simmons’ Notes

Rostra Ultra Cruisell Manual 10-1998

Rostra World Cruisell Manual 2-2000

(Source: Duane Simmons & Others | Emery Stora downloaded from Rostra Site)


>> Wire/Circuit Diagrams

12vdc-ZEO6581 (Source: GMC Maintenance Manuals)

12vdc-ZEO6582 (Source: GMC Maintenance Manuals)

120vac-ZEO6581 (Source: GMC Maintenance Manuals)

120vac-ZEO6582 (Source: GMC Maintenance Manuals)

Chassis Motorhome (Source: GMC Maintenance Manuals)

Chassis Transmode (Source: GMC Maintenance Manuals)

X7321A | Electrical Diagram (Source: GMC Maintenance Manuals)

1973 | 12vdc Engine (Source: GMC Maintenance Manuals)

1973 | 12vdc Living Area (Source: GMC Maintenance Manuals)

1975 | 12vdc Living Area (Source: GMC Maintenance Manuals)

1975 |  120vac Living Area (Source: GMC Maintenance Manuals)

1975-1976 | 12vdc Living Area (Source: GMC Maintenance Manuals)

1975-1976 | 120vac Living Area (Source: GMC Maintenance Manuals)

1975 | Engine Breaker Points (Source: GMC Maintenance Manuals)

1975 | Engine Breaker Points Transmode (Source: GMC Maintenance Manuals)

1975 | Engine HEI (Source: GMC Maintenance Manuals)

1975 | Engine HEI Transmode (Source: GMC Maintenance Manuals)

1977 | 120vac Living Area (Source: GMC Maintenance Manuals)

1977-1978 | 12vdc Living Area (Source: GMC Maintenance Manuals)

1977-1978 | 120vac Living Area (Source: GMC Maintenance Manuals)

1977-1978 | Chassis Electro Level I (Source: GMC Maintenance Manuals)

1977 | Coachmen 23′ Rear Bath Electrical & Plumbing Drawings (Source/Scan: Emery Stora)

1977 | Coachmen 26′ Rear Bath Electrical & Plumbin Drawings (Source/Scan: Emery Stora)

Avion 12v (Source/Scan: Emery Stora)

Avion 120v (Source/Scan: Emery Stora)