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Unfortunately, in 1988 Ford was using an alternator with an internal voltage regulator (one wire instead of 3).
The gauges are run by a 7.5 amp fuse and I think you're spot on with how to start troubleshooting. You can tell the difference between the temp sender for the ECM versus the temp sender for the dash easily; The sender for the ECM has 2 wires and the one for the dash only has 1 wire. The sender grounds the gauge, so the test light will come on.
Under the dash of the superduty chassis it was pretty standard Ford truck, but it got hairy once you got past the firewall since every body manufacturer had their own standard for running the wires. |
RV and bus conversion info since 1996.
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