no start trouble

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

Hi Romuald
Welcome

Check your grounds,make sure you have a good ground to the engine,and a good ground to the block.
Nice truck,i just got a 88 Suburban back that was my mom and dad's years ago.It was an official veihical of the 1988 Winter Olympics.Mine is gas but that will change.

Quote:

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Originally Posted by Yukon6.2

Hi Romuald
Welcome

Check your grounds,make sure you have a good ground to the engine,and a good ground to the block.
Nice truck,i just got a 88 Suburban back that was my mom and dad's years ago.It was an official veihical of the 1988 Winter Olympics.Mine is gas but that will change.

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thank you, i'll look my ground to the engine , but (sorry for my english , sometimes poor... ) what do you name 'block" ? is it the fuse box ?




her are some pictures 1st when I baught it. second, now. sorry for the size...

https://scontent-cdg2-1.xx.fbcdn.net...f6&oe=5F8F1F16


https://scontent-cdt1-1.xx.fbcdn.net...43&oe=5F8F30CD

thank , i'll look for the ground.


what do you call "ground to the block" (I'm not sur of my technical englis...)

Hi Again
Block i referred to is the engine block.
A friend of mine just had starting problems on his GM pickup.
He changed the ignition switch,starter,and spent a few day working on it and in the end the ground straps from the frame to the engine block were disconected.

Quote:

---

Originally Posted by Yukon6.2

Hi Again
Block i referred to is the engine block.
A friend of mine just had starting problems on his GM pickup.
He changed the ignition switch,starter,and spent a few day working on it and in the end the ground straps from the frame to the engine block were disconected.

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ok , I understand. i'll look for it this week-end .



thanks



i'll let you know

Was wondering if you got this fixed I was going to say ignition switch that is bolted to the under side of the steering column