Re: [DML] Strange Relay

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

An undocumented relay. It bypasses 1/2 the ballast resistor during
cranking to give a higher voltage to the coil to help start the motor.
The logic is that during cranking, which is a very high draw on the
battery, the battery voltage goes down so you don't need as much
resistance to the ignition coil keeping the spark a little hotter.
This relay is an addition, it has it's own separate harness. IMHO it
isn't all that necessary but it can't hurt. The relay prevents a
problem in the ignition circuit from getting back into the start
circuit and making the starter run. Safer than just running a wire to
the resistor from the start switch like on most American cars.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote:
>
> Scott, 
> On some cars there is no relay, the blue/yellow wire comes from the
starter
> solenoid to supply as highest voltage to the ignition coil thru the
resistor
> as possible when cranking. Normally if everything is ok the voltage
will be
> around 10.25 volts going to the coil. I guess in thinking that there
wasn't
> any safety built in they would add a relay to handle the voltage
thru and
> that's why they have them now. I also added this relay to our relay kit
> years ago because of it being outside. 
> Either way the blue /yellow wire is only good when the car is
starting and
> as you can see it cuts off and only goes thru 1/2 of the resistor to
make
> the voltage a little stronger going to the coil.
> John Hervey
> www.specialtauto.com
> www.deloreanautoparts.com
> The last of the independent DeLorean parts vendors.
> 
> 
>    
> 
> -----Original Message-----
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On
Behalf Of
> Scot Stern
> Sent: Saturday, May 12, 2007 11:32 AM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: [DML] Strange Relay
> 
> My DMC, 6452 has a strange relay in the engine compartment.  On one 
> of my trips to Don at DMC Garden Grove, a number of years ago, he 
> indicated that it was a modification made at the QAC.  
> 
> I have an extra relay, located right below the engine cover switch, 
> in the engine compartment.  The wiring harness for this relay is 
> clearly part of the main harness and appears to be original.  The 
> wires are as follows:
> 
> It gets a ground from the frame by the resister pack.  
> 
> It gets a hot off of the main terminal next to the battery post in 
> the engine compartment.  
> 
> It has a wire off of the number one terminal on the coil.
> 
> It has a wire to the starter.
> 
> It would appear, that when the starter is actuated, it trips the 
> relay which would then supply 12 volts directly to the coil.
> 
> What we be the purpose of this arrangement other than to increase the 
> voltage to the coil?  Is it necessary and should I leave it 
> installed?  I am reluctant to change anything as it starts fine and 
> runs great and it looks like it was original.
> 
> Please remember, that this car originally belonged to John's wife and 
> was at their home near San Diego.  It only had 3,000 on it when I 
> bought it and it does apparently have a few other strange quirks.  
> Maybe, QAC did some magic on it as some kind of a test.....
> 
> Last night, I had a chance to look at Chris's Delorean, which is one 
> serial number higher than mine and his does not have this 
> arrangement.  Thoughts? 
> 
> Scot Stern
> 6452 
> 
> 
> 
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