electrical problems. HELP!!!
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500, 472, 425, 368 Discussion, electrical problems. HELP!!! in Cadillac Engine Technical Discussion; hey, i own a 1970 cadillac sedan deville, that runs like a champ except for that it cuts out on ...
  1. #1
    1970caddy is offline Cadillac Owners Member
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    Unhappy electrical problems. HELP!!!

    hey, i own a 1970 cadillac sedan deville, that runs like a champ except for that it cuts out on the road. it shuts itself off, but not totally off, it almost sounds like a desiel pickup when it does this. the generator light on the dash comes on while its doing this (it was the oil light for alittle bit until it moved to the generator light). sometimes it backfires and is running good for a few minutes, or it will shut off altogether and you have to restart it. at first i thought it was a bad ground, so i replaced the battery ground cable, and put a ground strap from the altinator to the frame of the car. that still hasnt fixed it. now i'm thinking it might be the coil, but i'm not sure. any help would be greatly appreciated!
    thanks

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    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
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    Re: electrical problems. HELP!!!

    This doesnt sound electrical to me.... It sounds more like a stuck valve or something....

    Does yours have the 8-6-4, im cant remember when that came out......

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    DaveSmed's Avatar
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    Re: electrical problems. HELP!!!

    How is it when the car is cold, when you first drive it in the morning?

    BTW, I'll move this into the engine section for you, because as Wes said, it doesn't sound like an electrical problem.

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    MMNineInchNails's Avatar
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    Re: electrical problems. HELP!!!

    Nice choice in vehicle. My car does that when I turn it off, but that's because of the horrible carb tuning and maybe a little bit off of the timing.

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    davesdeville is offline Banned
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    Re: electrical problems. HELP!!!

    Wes, the 864 came out in '81.

    It might be the coil, .. I have no idea.

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    Re: electrical problems. HELP!!!

    could even be the carb like a cut out of fuel or something. Try getting some carb cleaner. The fuel pumps are usually good, but the q-crap sucks it up.

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    Angela Desmond is offline Cadillac Owners Fanatic
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    Re: electrical problems. HELP!!!

    I had a similar problem in my '77 Chevy. I was running a Mallory Unilite distributor in there which uses an electric eye to fire the plug. That problem drove me crazy for months until I figured out it was the electric eye that was shot. I replaced the distributor to a more conventional type of HEI that uses an ignition module.Never had the problem again. Your module can only be checked with special equipment( I believe) but that could be the problem. Either have it checked or price a new one and just replace it to be sure. A problem like yours can be so many things you'll just have to keep checking different things until you come up with it. Your "GEN" light and oil light will come on because the engine stopped and can't turn the belt to run the Alternator, so with no charge coming out of it the light comes on. It happens with a very loose belt also.Same with the oil light. No spinning engine to turn the oil pump, so it senses no oil pressure and warns you. Good luck...

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    1970caddy is offline Cadillac Owners Member
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    Talking Re: electrical problems. HELP!!!

    thanks guys. i already put a new coil and new belts on it and they were tight so. i'll have to probably ugrade to HEI, better also. i'll try the carb cleaner also...thanks again.

  10. #9
    DaveSmed's Avatar
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    Re: electrical problems. HELP!!!

    At this point, i'd only upgrade to HEI if thats the setup you prefer. As far as ignition goes, check the points, condensor, cap and rotor. If they are adjusted properly and in good working order, you should be fine. When the generator light comes on, does it suddenly pop on, or does it flicker first and then come on solid. If it flickers, I would suspect something else causing the engine to stall, probably due to too low of an idle.

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    Angela Desmond is offline Cadillac Owners Fanatic
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    Re: electrical problems. HELP!!!

    Didn't realize you had a points distributor in there, so my module theory is moot. We've upgraded a couple of points style ignitions to HEI with conversion kits. It's cheaper than a whole new distributor but the distributor should be in good working order.( no loose shaft or bad advances). I'm considering doing it to a '53 Dodge 230 flathead that we have in an M37 Powerwagon. We used the Crane system in a '70's MG and were very happy with the results.

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    1970caddy is offline Cadillac Owners Member
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    Unhappy Re: electrical problems. HELP!!!

    hey, i just put a new rotor and cap in the distributor along with new spark plugs and spark plug wires about 3 weeks ago. the light comes on, it dont flicker or anything, sometimes it will pop and kick itself back to normal and it will work fire for a few minutes...just recently it has started to do it when it was just idling. before it would just do it going down the road.

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    Angela Desmond is offline Cadillac Owners Fanatic
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    Re: electrical problems. HELP!!!

    You didn't mention if you changed those points AND condenser. Very important items, to say the least.

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    Re: electrical problems. HELP!!!

    I'm thinking carb tuning or just build up of crap in the carb.

  15. #14
    1970caddy is offline Cadillac Owners Member
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    Re: electrical problems. HELP!!!

    hey, i havnt changed the points or condensers yet...i had my boss look at them and he said they were fine, but i'm thinking they havent been changed for a couple years so i suppose its time to replace them. i'm goin to try that carb thing also, because it might just be cloged and restricting fuel, maybe.
    thanks

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    Re: electrical problems. HELP!!!

    This is probably not it, but check the fuel filter too. It's on the front of the quadracrap in the little hosing where the metal fuel line goes in.

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