Specifications & Measurements
- Hitch ball size: 1 7/8 or 2 inch ball.
- Maximum hitch height is specified as 25 inches
- Measured natural height of trailer hitch ball receiver: 19 inches ground to bottom ( stopped by a U Haul to get this number. It applies to the hitch seen in the diagram above. Simpler version without auto safety break will be slightly lower.
- Height of the top of the square of my hitch receiver is: 14.5 inches
A rise of about 3 inches would put the hitch at the natural height. Will use the bigger ball.
Research Links
- 6 x 12 foot U Haul Trailer
- UHaul 4 way flat adapter converter
- UHaul 4 Way Adapter Instructions
- Ebay: 7 Pin to 4 way adapter
My best guess is that the converter consists of some connections or resisters + connections at a minimum. Will enter what I find here later.
Auxiliary Links
The trailer hitch design height used worked for a 2100 mile journey. Grateful that is over. Two Arizona trips and a trip to Washington D.C. Ouch. Now if I could only find a used Uhaul trailer. I really like this 2 axle trailer.
Chapter 2
The right hand blinky function would not work on the trailer I purchased after I connected it the second time. Turned out the round to flat adapter must have deformed when I shoved in the adapter.
Debug Sequence
- Shake everything – no help
- connected jumper cable from chassis to trailer – no change
- Drove around the block – contrary to what was suggested the ground does not go through the metal hitch
- checked all the functions – found that only the right blinky / braking display was affected – running lights were unaffected
- Used multimeter to see that the right hand Turn / Stop function was the only connection out of the round-to-flat adapter with no signal – Green Wire
- Went and bought replacement fuses – last time I had a problem it was the fuses – Roger helped debug with his buzzy tool – replaced fuse – no change
- Used a cheap battery charger set to 6 volts to show that trailer wiring was not involved – connected to the various pins and saw all wiring good
- Now suspect flat adapter back to fuse box. Used my second adapter – Problem solved. All functions go.
Fuse Box Map
https://www.autogenius.info/ford-e-series-e-150-e150-e-150-1998-2001-fuse-box-diagram/
| Fuse/relay location | Ampere rating [A] | Description |
| 1 | — | Not Used |
| 2 | — | Not Used |
| 3 | — | Not Used |
| 4 | 10 | PCM Keep Alive Memory, Instrument Cluster |
| 5 | 10 | Right Trailer Turn Signal |
| 6 | 10 | Left Trailer Turn Signal |
| 7 | — | Not Used |
| 8 | 60 | I/P Fuses 5, 11, 23, 38, 4, 10, 16, 22, 28 |
| 9 | 30 | PCM Power Relay, Engine Compartment Fuse 4 |
| 10 | 60 | Auxiliary Battery Relay, Engine Compartment Fuses 14, 22 |
| 11 | 30 | IDM Relay (1998 1/2 Vehicles) |
| 12 | 60 | Engine Compartment Fuses 26, 27 |
| 13 | 50 | Blower Motor Relay (Blower Motor) |
| 14 | 30 | Trailer Running Lamps Relay, Trailer Backup Lamps Relay |
| 15 | 40 | Main Light Switch |
| 16 | 50 | RKE Module, Auxiliary Blower Motor Relay |
| 17 | 30 | Fuel Pump Relay, IDM (Diesel) |
| 18 | 60 | I/P Fuses 40, 41 |
| 19 | 60 | 4WABS Module |
| 20 | 20 | Electric Brake Controller |
| 21 | 50 | Modified Vehicle Power |
| 22 | 40 | Trailer Battery Charge Relay (Modified Vehicles Only) |
| 23 | 60 | Ignition Switch |
| 24 | — | Not Used |
| 25 | 20 | NGV Module |
| 26 | 10 | Generator/Voltage Regulator (Diesel Only) |
| 27 | 15 | DRL Module, Horn Relay |
| 28 | — | PCM Diode |
| 29 | — | Not Used |
| A | — | Not Used |
| B | — | Not Used |
| C | — | Trailer Backup Lamps Relay |
| D | — | Trailer Running Lamps Relay |
| E | — | Trailer Battery Charge Relay |
| F | — | IDM Relay |
| G | — | PCM Relay |
| H | — | Blower Motor Relay |
| J | — | Horn Relay |
| K | — | Fuel Pump Relay, IDM Relay (Diesel) |
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