Cadillac & LaSalle Club Discussion Forum

Cadillac & LaSalle Club Forums => General Discussion => Topic started by: Steve Passmore on September 18, 2017, 06:27:16 AM

Title: Cadillac flathead alternators
Post by: Steve Passmore on September 18, 2017, 06:27:16 AM
Just finished my first one. Made from the only CS121 I have been able to find in this country so far. Front bracket was Lazer cut and my son machined the front alternator casing to suit.
I found a supplier in Canada for a few at a more reasonable cost so I'm looking into that.  I think Mr Becker had a good deal with Delco to have been able to sell them so cheaply.
Title: Re: Cadillac flathead alternators
Post by: robert G. smits on September 19, 2017, 09:10:42 PM
If you make another one I would be interested.  Bob Smits  #2426
Title: Re: Cadillac flathead alternators
Post by: Steve Passmore on September 20, 2017, 09:09:56 AM
Send me a PM Robert.
Title: Re: Cadillac flathead alternators
Post by: Giff on September 20, 2017, 11:09:19 PM
Hey Steve are these alt. 6 volts
Thanks
Title: Re: Cadillac flathead alternators
Post by: Steve Passmore on September 21, 2017, 03:19:14 AM
No Giff, I am unable to find these CS121 type here at all let alone 6volt, but the conversion could be done to them too.
Title: Re: Cadillac flathead alternators
Post by: Giff on September 21, 2017, 08:56:42 PM
thanks
Title: Re: Cadillac flathead alternators
Post by: Giff on September 22, 2017, 11:04:38 PM
when you change to 12v do you leave 6v starter or change every thing 12? I sure wish mine turned faster!
Title: Re: Cadillac flathead alternators
Post by: C Gorgas on September 23, 2017, 09:30:28 AM
Giff, type in the search column "six volt starter grounding cable" and you will find the answer to speed up your starter. It is an easy fix for the problem. Chet 25441
Title: Re: Cadillac flathead alternators
Post by: Giff on September 23, 2017, 08:39:19 PM
thanks C Gorgus
Title: Re: Cadillac flathead alternators
Post by: Glen on September 24, 2017, 02:29:45 AM
Quote from: C Gorgas on September 23, 2017, 09:30:28 AM
Giff, type in the search column "six volt starter grounding cable" and you will find the answer to speed up your starter. It is an easy fix for the problem. Chet 25441

The grounding cable described in that post is a work around for a problem.  This is what I posted before.   

“The grounding strap on the brush plate is only necessary if it is not properly grounded.  That seems to be common when the starter is restored and painted.  The plate is grounded by contact to the body of the starter and the body is grounded by contact to nose which is in turn grounded to the engine block.  If those contact points are painted then the only ground is the bolts that hold the starter together.  Those two bolts do not have the necessary cross section to allow full current flow when starting the engine hence the slow cranking. 
If the paint is cleaned off in all the contact areas the starter will run properly without the extra strap. 
Rust can also cause this problem”
Title: Re: Cadillac flathead alternators
Post by: Giff on September 24, 2017, 09:50:08 AM
Thanks Glen,when I get a chance I will remove starter and clean.seems to crank good cold but when hot is when it don"t want to start,wondering if volts droping,I checked volts at bat.6,4 then started and reved motor it goes to6,8 is this enough voltage?
Title: Re: Cadillac flathead alternators
Post by: Glen on September 25, 2017, 02:03:55 AM
My experience is that may be a tad low.  I set my voltage regulators to 14.2 Volts for a 12 volt battery.  That would be 7.1 volts for a 6 volt battery.   
Others may think that is a bit high, but I rarely drive long distance so the higher voltage helps keep the battery charged. 
See how the 6.8 volts works for you.