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Poor Pete's Mk1 flat battery in the morning

Pete is a real MX5/Roadster enthusiast and as such owns all version of the car. He's also incredibly unlucky with his cars which suffer from just about every ailment we have come across (and a few we haven't - yet). With your help we can keep all his cars on the road and the smile on his face so please come in and see if you can help.

THESE ARE COMMON AND GENUINE PROBLEMS WITH REAL ANSWERS - WELL WORTH A READ
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Andrew
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Poor Pete's Mk1 flat battery in the morning

Postby Andrew » Sat Oct 13, 2012 11:33 am

Pete is occasionally getting in his mk1 1.6 Eunos in the mornings to find the battery has gone flat. He charges it up on his trusty trickle charger for a day and it seems fine. He's checked that nothing is left switched on. Sometimes he can leave the car for a week without the battery going flat, other times he parks the car at midnight, but when he comes out at 6am, the battery is totally dead. What should he try next to find the cause?
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Re: Poor Pete's Mk1 flat battery in the morning

Postby DavesBRG5 » Sat Oct 13, 2012 11:45 am

I`d start by getting the alternator & battery checked out! Odd that it can survive a week when not in use though so i`d suspect a duff alternator.
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1992 ROADSTER 1.6 Tanabe Sustec suspension, Cusco bracing, Momo Prototipo steering wheel, Mike Satur TT Hoops, Jass Performance interior bling.

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Re: Poor Pete's Mk1 flat battery in the morning

Postby Andrew » Sat Oct 13, 2012 11:51 am

battery is ok, it often holds a charge for a week. When the car is running Pete checks across the battery terminals with his voltmeter, it shows 14.5 volts, so the alternator should be good.
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Re: Poor Pete's Mk1 flat battery in the morning

Postby Mazda Mender » Sat Oct 13, 2012 12:50 pm

Is the connections on the Bat OK and the earthing points
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 fettled,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
Mk 1 Eunos 96 1.8 blue B2...being fettled
Mk1 Eunos 93 1.6 black S special being fettled
http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
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Re: Poor Pete's Mk1 flat battery in the morning

Postby Andrew » Sat Oct 13, 2012 1:00 pm

battery connection is good, he's also checked where the battery earth bolts to the body, and the earth strap at the rear of the engine behind the exhaust manifold, and even the one to the rear of the powerplant frame, all are good connections.
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Re: Poor Pete's Mk1 flat battery in the morning

Postby Mazda Mender » Sat Oct 13, 2012 1:08 pm

Is she a Auto and the electric solenoid at the gear selector is shot that works from using the foot brake to engage gears giving bettery drain, common fault on autos.

M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 fettled,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 being rebuilt,
Mk 1 Eunos 90 1.6 (claimed by daughter)
Mk 1 Eunos 96 1.8 blue B2...being fettled
Mk1 Eunos 93 1.6 black S special being fettled
http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
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Re: Poor Pete's Mk1 flat battery in the morning

Postby Andrew » Sat Oct 13, 2012 1:31 pm

nice try, but no, car is a manual. Also in the auto with the solenoid problem, the battery would last for a day at least without going flat.
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Re: Poor Pete's Mk1 flat battery in the morning

Postby Andrew » Sat Oct 13, 2012 2:09 pm

Headlamps are both bright and connectors are not melted, but Pete was thinking of doing the 'flash to pass' headlamp mod so the lights pop up when he flashes them. He's doing that this afternoon I think.
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Re: Poor Pete's Mk1 flat battery in the morning

Postby Lazza » Sat Oct 13, 2012 10:26 pm

Does he have a dodgy headlight stalk meaning his headlights come on without popping the headlights sometimes?
Lazza

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Re: Poor Pete's Mk1 flat battery in the morning

Postby Andrew » Mon Oct 15, 2012 9:05 am

Lazzer has it right. After Pete fitted the flash to pass diode, the mod worked ok, but yesterday morning the battery was completely dead and the lights were stuck in the up position.

The combination lights/wipers stalk had gone wrong, causing main beam to come on occasionally. He hadn't noticed when the lights didn't pop up as they just lit up the ground under the car.

We suggested he leave the light stalk pushed away from him when the car is parked, that way the flash won't be triggered.

This seems to be a problem that only affects cars with the early straight lights/wiper stalks from 1989 to early 1995.
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Andrew
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