WingsOnWheels
Well Known Member
So I am trying to install and time my mags. I have done this before without an issue, but this is the first time I have use one of the inductance timing boxes rather than the basic resistance buzz boxes.
I have Bendix S4-20/21 mags with the P-Lead noise filter. I was under the impression that the inductor-type box worked with the filters install (I don't have a set of the adapters at the moment), but that may not be correct.
Round 1: I installed the mags and connected the timing box to the p-lead connection on the filters and the ground lead to the engine. Received no indication of points open/closed as the engine was turned (went around a couple times and checked my connections to be sure).
Round 2: I figured the timing box wouldn't work with the filters, so I unscrewed the P-Lead plug in the point cover and pushed the timing lead into the hole to touch the spring and move it away from the case. Turned the engine with the other hand, still nothing.
Round 3: I figured that I wasn't able to move the spring away from the cover plate to keep it from grounding, hence no indication. So, I pulled the right mag, removed the points cover and connected the lead directy the the P-Lead spring. I also connected the ground to the mag case. Turned the mag and watched the points open and close, no indication of change on the timing box.
Round 4: Thought maybe the points are well out of spec and not closing (even though the mags came from a running engine), checked with an ohm-meter. The meter indicated the points were opening and closing.
I thought that the timing box may be bad so I called the manufacturer and they told me to test it using the coil from a relay or other device. The timing box tested as working correctly.
Any ideas what the heck I am doing wrong????
Thank,
I have Bendix S4-20/21 mags with the P-Lead noise filter. I was under the impression that the inductor-type box worked with the filters install (I don't have a set of the adapters at the moment), but that may not be correct.
Round 1: I installed the mags and connected the timing box to the p-lead connection on the filters and the ground lead to the engine. Received no indication of points open/closed as the engine was turned (went around a couple times and checked my connections to be sure).
Round 2: I figured the timing box wouldn't work with the filters, so I unscrewed the P-Lead plug in the point cover and pushed the timing lead into the hole to touch the spring and move it away from the case. Turned the engine with the other hand, still nothing.
Round 3: I figured that I wasn't able to move the spring away from the cover plate to keep it from grounding, hence no indication. So, I pulled the right mag, removed the points cover and connected the lead directy the the P-Lead spring. I also connected the ground to the mag case. Turned the mag and watched the points open and close, no indication of change on the timing box.
Round 4: Thought maybe the points are well out of spec and not closing (even though the mags came from a running engine), checked with an ohm-meter. The meter indicated the points were opening and closing.
I thought that the timing box may be bad so I called the manufacturer and they told me to test it using the coil from a relay or other device. The timing box tested as working correctly.
Any ideas what the heck I am doing wrong????
Thank,
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