Re: [DML] car mysteriously died
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Re: [DML] car mysteriously died



Hi Andy

The ignition coil cannot take 12v, so the feed to the coil passes through those two resistors. However as we all know, cranking causes the voltage on the battery to drop - maybe to as low a 6-8v when not fully charged. And of course when cranking, the one thing you really want is a decent spark! So, the purpose of that relay is to short out one of the two resistors giving the coil more of the available voltage to create a spark. The supply to the relay comes strait from the starter solenoid. John Hervey has a diagram on his website but I think it isn't 100% correct.

However, open or closed, that relay should not affect the coil getting a feed.... the only thing I can think of is that there's something seriously terminally wrong with that relay and it's grounding your coil feed!

I suggest you cut off and re-crimp all the connectors going to the ballast resistors, and clean up all the contacts. Also replace that relay. I have a nice new sealed plastic one with integral blade fuse at 5A. My car now starts much better, especially on a damp morning.

BTW all through your post I was thinking "fuel pump" until you noted that it started and shut down fine. This tells you immediately that the RPM relay is working correctly, which was my first guess based on your symptoms.

Martin
#1458
#4426

Soma576@xxxx wrote:

then checked my ignition wires again and i pulled the relay out of the socket which is right next to the ignition resistor. then i tried starting the car and this time it ran and didn't quit! i drove it home.

any idea if this relay was coincidence? what does it do? any other ideas?

Andy









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