Here is the bulletin from Ford which explains what must be done to prevent galvanic corrosion. More information on the MIL, and the codes which cause it to illuminate, are in the electronics article.įord's F-series, and other aluminum-bodied vehicles require special installation practices with respect to galvanic corrosion. Whether these codes cause the MIL to illuminate is moot. It should also be noted these conditions can cause codes to be written into the OBDII's memory. The issue is pervasive enough, that some vehicle manufacturers have disclaimers about the issue written into their Owner's Manuals. Arcing can also occur between the spring-loaded tip of the accessory socket plug, and the positive contact inside the socket. There is yet another issue surrounding the use of accessory sockets, factory-supplied 120 volt inverters, and that is RFI generated by the electronics built into these devices. Ignore this rule, and your vehicle may end up looking like a burnt cinder! Thermolysis may occur within a few minutes, or over an extended length of time. It is the decomposition of the insulation covering the wire, brought about by high temperatures- resistive heating in other words. The process is called thermolysis (aka pyrolysis). It's more likely that there was a combination of causes: human causes, mechanical causes, and chemical causes, and they all worked together to create an incredibly dangerous situation. There's rarely a single cause for any given car fire, even if an investigator can trace all the way back to the incident that sparked the blaze. This can occur without activating the circuit protection. Unintended high-resistance faults in wiring can raise the conductor temperature to the ignition point of the insulation, particularly in bundled cables such as the wiring harnesses or the accessory wiring under the dash where the heat generated is not readily dissipated. This includes fuse taps, and so-called accessory sockets, aka cigarette lighter sockets! In part from the National Fire Protection Association, sub-section 15-3.2.1: Never, ever use existing vehicle wiring to power any amateur radio gear. Contents: Never Use Existing Vehicle Wiring! Where To Connect Power Ground Loop Adequate Power Expelling A Few Myths Factory Power Cables What Size Wire to Use Insulation & Stranding Wire Lugs & Terminations Terminating Blocks All About Fuses Circuit Breakers A Few Words On Relays Fuse Holders Wiring Through the Firewall Hiding the Wiring Under Chassis Wiring Power Protectors
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