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Starting motor off battery
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rogerd20
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PostPosted: Mon Jul 17, 2017 4:06 pm    Post subject: Starting motor off battery Reply with quote

Okay guys, I just got a 73 westy that I'm wanting to test the motor in. The factory wiring in the engine bay is a bit of a mess. I remember testing a old vw motor years ago just off of a battery. I'm just wondering if the same is possible with a type 4 motor. I ran a wire from the hot on the battery to the hot on the ignition coil and a ground from the battery to the ground on the ignition coil. When I power the starter it cranks but no spark. Am I going about this the wrong way? Anyone ever do this?
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DuaneL
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PostPosted: Mon Jul 17, 2017 4:31 pm    Post subject: Re: Starting motor off battery Reply with quote

rogerd20 wrote:
and a ground from the battery to the ground on the ignition coil.


would be the problem the ground on the coil is only hooked up to the distributor (points, condenser to be more accurate)
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rogerd20
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PostPosted: Mon Jul 17, 2017 4:43 pm    Post subject: Re: Starting motor off battery Reply with quote

I have the main ground wire from the body hooked up as well
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DuaneL
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PostPosted: Mon Jul 17, 2017 4:49 pm    Post subject: Re: Starting motor off battery Reply with quote

But if you have a ground hooked up to the coil you will not get a spark, the spark is created by the points opening and removing the ground to the coil (points closed coil is grounded points open ground is removed from coil and spark occurs)
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busdaddy
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PostPosted: Mon Jul 17, 2017 5:20 pm    Post subject: Re: Starting motor off battery Reply with quote

My money's on corroded or dirty points, pinch some clean brown paper bag between them and shine them up, then see if you get a spark.
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rogerd20
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PostPosted: Mon Jul 17, 2017 5:51 pm    Post subject: Re: Starting motor off battery Reply with quote

I Removed the ground from
The battery to the coil, and cleaned all points. Still no spark. I may try putting a nice ground strap directly from the battery to the engine tomorrow.
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busdaddy
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PostPosted: Mon Jul 17, 2017 5:55 pm    Post subject: Re: Starting motor off battery Reply with quote

Connect a test light between the primary terminals on the coil an watch it as you crank, flash flash flash?, steady?, or dark when cranking?
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rogerd20
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PostPosted: Mon Jul 17, 2017 5:59 pm    Post subject: Re: Starting motor off battery Reply with quote

I'll try it first thing tomorrow when I get off work and update you.
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rogerd20
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PostPosted: Tue Jul 18, 2017 2:33 pm    Post subject: Re: Starting motor off battery Reply with quote

I cleaned all the points again and put a ground strap on, fired on the first crank. Can't thank you guys enough for the help. Very Happy
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