docs: Add distributor cap/rotor installation instructions

- Document that cap/rotor were on 2002 3500, need to be installed on 2002 1500
- Provide step-by-step installation instructions
- Include tools needed, parts info (GM 10452459 cap, 10452457 rotor)
- Add firing order reference (1-8-7-3-6-5-4-2)
- Document verification steps after installation
- Once installed, proceed with Issue #1 (ECU relay test)

CrankNoStart/progress.md

@@ -159,7 +159,102 @@
 
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-**Next Step:** Check ECU power supply BEFORE replacing ECU again!
+**Next Step:** Install distributor cap/rotor (removed for 2003 3500 parts), THEN continue ECU power tests!
+
+---
+
+## 🔧 Immediate Action Required (2026-03-22 19:32 EDT)
+
+### Current Situation:
+- Distributor cap and rotor were removed from **2002 Chevy 1500** (bad van)
+- Installed on **2002 Chevy 3500** (good van) yesterday to fix crank no-start
+- **Now:** Cap and rotor are on the 3500, need to be put back on the 1500
+
+### Action Needed:
+1. **Remove distributor cap and rotor from 2002 Chevy 3500**
+2. **Install on 2002 Chevy 1500**
+3. **Verify proper installation** before continuing ECU power tests
+
+### Why This Matters:
+- Without distributor cap/rotor, the 1500 cannot run
+- We need spark to continue testing
+- ECU power tests require spark to verify results
+
+---
+
+## 📋 Distributor Cap/Rotor Installation Instructions
+
+### Tools Needed:
+- 7mm or 8mm socket (for cap clips)
+- Dielectric grease (optional but recommended)
+- Clean rag
+
+### Parts Being Installed:
+- **Distributor Cap:** GM 10452459 (or ACDelco DR2031)
+- **Distributor Rotor:** GM 10452457 (or ACDelco D465)
+- **Part Numbers for 2002 Chevy Express 1500/3500 (5.7L V8)**
+
+### Installation Steps:
+
+#### Step 1: Prepare the Distributor
+1. **Clean distributor housing** with rag - remove any debris
+2. **Inspect distributor housing** for cracks or carbon tracking
+3. **Apply dielectric grease** (optional) to cap terminals inside
+4. **Check rotor condition** - should be clean, no carbon tracking
+
+#### Step 2: Install Rotor
+1. **Align rotor** with distributor shaft (should only fit one way)
+2. **Press rotor firmly** onto shaft until it seats
+3. **Verify rotor spins freely** without wobble
+
+#### Step 3: Install Distributor Cap
+1. **Orient cap correctly** - number 1 terminal should face the correct cylinder (check firing order)
+2. **Align cap clips** with distributor housing
+3. **Press cap down firmly** until clips snap into place
+4. **Double-check all clips** are secured
+
+#### Step 4: Install Spark Plug Wires
+1. **Follow firing order:** 1-8-7-3-6-5-4-2
+2. **Start with cylinder 1** - wire from cap terminal #1 to spark plug #1
+3. **Push wire firmly** onto both cap and plug until it clicks
+4. **Route wires properly** - don't cross over hot exhaust manifolds
+5. **Double-check all connections** are secure
+
+#### Step 5: Verify Installation
+1. **Visual inspection** - all wires connected, cap secure
+2. **Tug test** - gently pull on each wire to ensure firm connection
+3. **Check for proper routing** - wires not touching hot surfaces
+
+---
+
+### Firing Order Reference (2002 Chevy Express 5.7L V8):
+```
+        #1   #5
+      /       \
+    #7         #3
+    |           |
+    |           |
+    #6         #4
+      \       /
+        #8   #2
+```
+
+**Firing Order:** 1-8-7-3-6-5-4-2 (clockwise from #1)
+
+**Distributor Rotation:** Clockwise
+
+---
+
+### After Installation:
+1. **Verify spark plug wires are correct**
+2. **Check for any loose connections**
+3. **Ready for ECU power testing**
+
+---
+
+**Once cap and rotor are installed, we can continue with Issue #1 (ECU Relay Test)!**
+
+**Action:** Install cap/rotor on 2002 Chevy 1500, then report back and we'll start testing!
 
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