I concur and would start with the charging circuit: betting on a bad
voltage regulator. And if you don't have a test light a meter set to
current (mAÂ DC) is a nice tool as well (especially if there is more
than one problem).
Regards,
Mark Miller 707-490-5834
markmiller@threeboysfarm.com
On 10/27/2020 11:00 AM, datsun-roadsters-request@autox.team.net wrote:
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> Maybe a bit more difficult on a murdercicle but here's how I do it on a car.
> Charge the battery so it's at least 1/2 charged, then take the negative cable
> off the battery. Put a test light between the battery post and the cable end.
> If there is a drain, the light will light. Now start removing electrical
> things until the light goes out. (On a car I pull fuses one at a time.) When
> the light is out you know which circuit to tackle. That might be enough to
> get you started.
>
> Stan, who has 2 Yamahas under the deck; wife's DT125 and my DT250
>
> Not a roadster-specific question, but related to vintage vehicles (my '72
> Yamaha): Any tips on tracking down the cause of a battery draining down near
> flat after a couple of days of sitting? New(ish) wet-cell battery, just
> topped up the acid this Friday, charged it up. On Saturday the bike started,
> ran fine (after I cleaned a couple of fouled spark plugs ? two-strokes, you
> gotta love 'em), but went to try it again this evening and it barely lights
> the neutral light.
>
> Gary McCormick
> '70 Datsun Roadster
> SRL311-13291
> San Jose, CA[Roadsters] Electrical question
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