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Message: [QUOTE="Dave_Nevada, post: 1499133, member: 29749"] [b]Here's some help. Been there done that.[/b] Testing notes for my Early 99 7.3 injector / glow plug harness under the valve covers 1. During the continuity check of the glow plugs, attach the black meter lead to engine ground somewhere on the head. Touch the positive meter lead to the head and obtain a baseline resistance reading. Make note of it. 2. For each glow plug checked, the resistance should be [U][B].9 to 1 ohms, but no greater than 1.5 ohms.[/B][/U] If it is, your [U]glow plug or gasket connector needs replacement.[/U] 3. If you read OL (digital) or no meter swing at all (analog meter), you have an open wire or bad contact on the harness. 4. For the sake of consistency, check each glow plug connector for continuity first. Then move to the injector continuity test. Injector Coils Place the meter red lead on the harness yellow, green, blue or red wire. Place the black lead on the black wire (center lug). The meter should read around [B][U]1.0 ohm[/U][/B]. Take all the injector measurements and compare. They should be balanced. If you see one out of whack, [B][U]you have a bad injector coil, connector or loose wire.[/U][/B] Again, when checking injectors for continuity, always set the meter to the lowest ohms setting. Simply look at the illustration and make your measurements based off the Ford harness. Note* Large lugs in the connector are for glow plugs (High current). The smaller lugs are for the injector wires. The center lug is always ground. Factory Harness color codes White = Glow Plugs (Large lug) Black = Injector Ground (Center) Yellow = Injector 1/8 (Smaller lug) Green = Injector 3/6 (Smaller lug) Blue = Injector 5/4 (Smaller lug) Red = Injector 7/2 (Smaller lug) CAUTION: Some 7.3 PCM’s (California program map) do not like after-market glow plugs resistance values. They will cause P1316 error codes. You must use factory spec glow plugs to clear the code. Burned wires/connectors cause problems for IDM's. If you look at the connectors, you'll see what I mean. Burned components cause an increase in resistance. Pull your valve covers and inspect the harness and connections. DO NOT USE COMMIE DORMAN VALVE COVER HARNESSES, THEY SUCK. Ask me how I know that. Spend the money and get OEM. Always use the 120 IDM on any 7.3 (Look at the tag on the box) 100 & 110 IDM's are just too wimpy to get the job done. 120's run the best. [/QUOTE]