Re: FrankenVega / FrankenCosworth
Posted: Mon Apr 27, 2020 8:46 am
~ Made some electrical progress. There is still a dead short somewhere that we haven't found. Everything is disconnected such as...the entire dash harness is disconnected, the blower circuit disc...alternator disconnected, choke wire, coil hot wire, fan relay unplugged, resettable relay on the fender well is disconnected, oil sending unit disconnected, wiper motor unplugged, ...still blowing the fuse on a circuit named - Gauge 30A.
~ We relocated the fuse box/harness connector about an inch or so , as you may recall, to make room for the hydraulic master for the throw out bearing. Mounted a steel plate on both sides of the firewall to attach the hydraulic master. Cut a hole in both plates to accommodate the harness connector. We thought we might have pinched a wire during that procedure, so we disassembled the harness connector to access the back side of the fuse box. While observing the back side of the fuse box, whic separates into two halves, we observed that the "Gauges" fuse, which is the one that keeps blowing, has a large PINK wire feeding the fuse and a smaller PINK wire exiting the fuse on the load side. No pinched wires were found, so we reassembled the fuse box and re-mounted it.
~ Concerning the high torque 2 terminal starter that replaced the 3 terminal starter and being that this 74 originally had a POINTS set up style ignition, one of the fusible link wires was no longer needed and eliminated ( we think). This was a wire that was used to supply full 12v to the coil to make up for voltage drop during cranking operations.
~ I was reading in the 77 Fisher H-Body supplement of a device that can pinpoint a short circuit in a bundle of wires to within 4 inches of the short. What baffles me about the short circuit in the "Gauges" circuit is that the fuse blows without the dash or instrument cluster being connected to the harness....weird...
~ We relocated the fuse box/harness connector about an inch or so , as you may recall, to make room for the hydraulic master for the throw out bearing. Mounted a steel plate on both sides of the firewall to attach the hydraulic master. Cut a hole in both plates to accommodate the harness connector. We thought we might have pinched a wire during that procedure, so we disassembled the harness connector to access the back side of the fuse box. While observing the back side of the fuse box, whic separates into two halves, we observed that the "Gauges" fuse, which is the one that keeps blowing, has a large PINK wire feeding the fuse and a smaller PINK wire exiting the fuse on the load side. No pinched wires were found, so we reassembled the fuse box and re-mounted it.
~ Concerning the high torque 2 terminal starter that replaced the 3 terminal starter and being that this 74 originally had a POINTS set up style ignition, one of the fusible link wires was no longer needed and eliminated ( we think). This was a wire that was used to supply full 12v to the coil to make up for voltage drop during cranking operations.
~ I was reading in the 77 Fisher H-Body supplement of a device that can pinpoint a short circuit in a bundle of wires to within 4 inches of the short. What baffles me about the short circuit in the "Gauges" circuit is that the fuse blows without the dash or instrument cluster being connected to the harness....weird...