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CF433 Regulator/Rectifier Resistance Test Chart ('84–'85) - Terminal Ohm Values

Diagnostic test procedure showing a connector pinout and a resistance value table for ohmmeter testing.

AI caption · Photo 18 of 141

This document is a test procedure for an electronic component (marked CF433) applicable to '84–'85 models, showing how to check it with an ohmmeter. A photograph at the top identifies the unit's terminals and their wire colors: IGN (Black/Yellow), SW (Black), EXT (Black/Red), PC (Blue/Yellow), E1 (Green), and E2 (Green). The instructions say to set the tester on the R x K Ω scale, with all readings expressed in K Ω. A resistance matrix follows, listing expected values for every combination of positive-probe and negative-probe terminal placement. Many combinations should read infinite resistance (∞), while specific pairings have expected ranges: EXT(-) to SW(+) reads 0.1–20 KΩ; PC(-) to SW(+) reads 0.5–200 KΩ; PC(-) to EXT(+) reads 0.5–100 KΩ; PC(-) to E1/E2(+) reads 1–5 KΩ; E1/E2(-) to SW(+) reads 0.2–60 KΩ; and E1/E2(-) to EXT(+) reads 0.1–2.0 KΩ. All combinations involving the IGN terminal read infinite in both directions. A hand-drawn arrow on the chart highlights the EXT(-) to SW(+) test point. A reader can use this to bench-test the component's internal diodes/circuits for failure.

This document covers 1984-1985, which may differ from this 1986 Ford Bronco.

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Frequently asked questions

What scale should the ohmmeter be set to for this test?
Set the tester on the R x K Ω scale; all values in the chart are in K Ω.
What are the terminal wire colors on the CF433 unit?
IGN is Black/Yellow, SW is Black, EXT is Black/Red, PC is Blue/Yellow, and E1 and E2 are both Green.
What resistance should be read between EXT (-Probe) and SW (+Probe)?
0.1–20 K Ω.
What readings should the IGN (Bk/Y) terminal show?
Infinite resistance (∞) in all combinations, whether IGN is the +Probe or -Probe.
What years does this document apply to?
The photo callout notes '84~'85.

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