by Gary Kneisley

Here are the major grounding points on the Morgan Roadster (USA).  These may be identical, similar or not at all like the ground on the late model +8s of the same vintage or the other world versions.


1. Behind the Fascia there is a ground terminal on the heater box.  Suggest moving this to the scuttle bar.

2. Engine had a ground strap to the scuttle (firewall).

3. Engine computer, inside the fuse box, a wire runs to a bolt on the bottom of the fuse box. 

4. Outside of right hand valence (remove the right front wheel) near the air intake tube.

5. On the rear chassis member near the right rear wheel.

6. And of course, the chassis to battery ground. 

I am certain there may be others, but these are the ones to check first when seeking grounding points to test.  Please let me know if you find more. 

edited by Gary Kneisley

Most Roadsters have experienced over heating problems early in their life but some people are purchasing low mileage Morgans that have not been driven much or on long trips. The first (non-US) Roadsters were fit with fine alloy rads and had no issues. But the Factory soon turned to the cheaper plastic rads they were using on the 4/4s. It was an immense saving! However, Roadsters are far more powerful than 4/4s. (Power = heat.) So from that point on the reasons for Roadster overheating multiplied and the primary reason became the fact of the inadequate radiator installed as standard by the factory after the first alloy rads. This was not epidemic at first in the UK if the car was driven mildly.  But the Factory soon increased the power by moving to the 3.7 liter engine. All of these models overheat from the first unless they are driven placidly. However, on a racetrack or a warm summer's day heating is chronic. A Roadster-modified version of Peter Mulberry's potent classic Plus 8 radiator cured the issues, but they are only offered as an expensive "upgrade" from Morgan rather than standard. 

WATCHPOINT: A chat with Peter Mulberry of Mulfab in England will explain the history of his research and the single best solution to radiator design for our cars. These radiators can be purchased direct from him or through Morgan Spares, which saves the hassle of overseas currency exchange charges and dealing with import fees etc. 

 Owners without a Mulberry soon instinctively adapt, as drivers do to any car. In this case, they drive their cars far below its potential..which is a sad pity considering the cost of this otherwise delightful a sports car.  

The second reason for Roadster overheating is easily curable if you know what is happening. Its rad fan becomes disconnected due to corrosion of the connecting block to the fan temperature sensor. Without a functioning fan, the car will quicky overheat.  In such a case, the rad fan merely needs a new connector, one more robust and positive connecting. Some have merely cleaned the connections and used a tie-wrap to insure it won’t come apart. Finding a replacement sensor was deceptively simple… it is a Ford part.  Admittedly this is a rarely used part in the Ford world and the parts desk will deny knowing what it is when you first show it to them, but his Ford Dealer punched the number into their computer and discovered that, indeed, it was a Ford part and THEY HAD ONE in stock.  It is Ford part number: F5RZ-8l603-AC and it’s called a “Resistor A”.  Remember to keep the pigtail from the old switch as you will need it.