Starter relay or no starter relay, Been reading up for an hour and still don't know!! Options

[David Stowers]

On two occasions recently on pulling onto my driveway after a long journey my car won't restart after turning off to unlock the garage door. Luckily I can then just push the car in but with a European tour booked in the summer I'd like to sort the problem.
When I get back in after opening the garage the lights on the dash dim when I turn the key to start but there is no click. 20 minutes later it will start right up. Is this the problem that will be solved by a hot start relay kit or just a good old fashioned sticky solenoid? I'd rather do just the relay or just replace the solenoid so which is it?
Thanks guys

[r_towle]

Might try cleaning your tranny ground strap.
I ended up replacing that ground strap and everything was fine.

The trigger is not pulling too much voltage.
The positive side of the starter goes directly to the battery.
The negative side of the starter relies upon the battery to chassis ground connection and the tranny to chassis ground connection.

That is typically the weak spot as they are old dirty connections.
I also found that over time, while visually it looks fine, the tranny ground strap looses it's ability to move current....just corrosion I suppose, but a new tranny ground strap does wonders for starting.

At the end of the day, and electric motor takes more power to turn when it's hot because things get tighter in there....so it may also be that factor.