DB 990

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Amended 19/09/18

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thedoctor
Posts: 6
Joined: Fri May 27, 2016 4:37 pm
Location: USA

DB 990

Post by thedoctor » Wed Jun 20, 2018 2:33 pm

Have a DB 990 selectamatic. New temp sensor, ignition switch, voltage regulator, battery. Problem; after sitting a few days the battery is drained and needs to be charged. When running there is 14.5 volts across the battery terminals. Any suggestions?

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rid54
Posts: 103
Joined: Mon Oct 13, 2014 8:20 am
Location: Vallentuna, Sweden

Re: DB 990

Post by rid54 » Wed Jun 20, 2018 5:36 pm

Something takes current even when ignition switch is "off". If an alternator is fitted, and it just has had new regulator fitted, it is unlikely that it will be the culprit. Nevertheless, you may have to hook up a current measuring intrument between battery + post and the + pole clamp to see how much you're losing, then disconnect the alternator thick cable, see if there is a change. If not, other circuits must be disconnected one at a time until the leakage path is identified. A schematic, and basic knowledge of the circuitry in general is needed, as well as an Ammeter with at least 10 A measuring capacity.

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bedwards1966
Posts: 810
Joined: Sun Mar 07, 2010 10:36 pm
Location: North Yorkshire

Re: DB 990

Post by bedwards1966 » Sat Jun 23, 2018 4:34 pm

You want to put an ammeter between the battery terminal and the (disconnected) battery lead with the ignition switched off. You shouldn't have anything taking current but if there is start disconnecting things until the drain stops. You can remove fuses, disconnect the alternator etc to locate the culprit.

One easy test though that's well worth doing is to disconnect the battery ground cable and leave it for a few days. If it's then flat you have a bad battery, if it's still charged then there's a problem with something draining it.

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