no start trouble

[romuald]

Hi everybody,



my name is Romuald and I live in France . I bought my dream car (GMC C1500 suburban sierra classic 6.2 diesel 1982 , TH700r4) few months ago ( january 2020) .

It had many different little issues to solve , but nothing difficult.


It has a manual button for glow plugs . i fixed an issue due to a too small relay (15A) , and replaced it with a 120A.

then the glow plugs work correctly.


My new problem since july is this :


- sometimes it starts very strong and correctly
- But sometimes, when i turn the key ignition to ON (not to activate the starter) , evrey electric part are off (no starter, no Glow plug possible, no interior lights or dashboard lights nor frontend light or signal . nothing....)

I need to let the truck few minuts or few hours , then it will start correctly.

I changed the ignition switch just in case, but didn't fix the problem.

I wondered if it was only if the engine is hot... mostly; but once I had the problem in the morning by a cold start (in july , not so cold....)

If anybody has an idea .

it's driving me nuts .....




thanks