Toyota Coaster BB20 body 3B engine power spikes

Submitted: Thursday, Aug 02, 2012 at 16:54
ThreadID: 97208 Views:2977 Replies:6 FollowUps:0
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Hi, we have a 1982 Toyota coaster (BB20 body) with a 3B engine and external regulated 12v alternator. We're traveling around Australia in it and recently - when running the engine - the voltage has shown a higher level (between 14 and 15 volt) and when using the indicators the power goes up and down in the rhythm of the indicator.
I have replaced the external regulator, thinking that would be the problem, but the same issue remains.

Any bright ideas?

Thanks, Axel
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Reply By: Lex M - Thursday, Aug 02, 2012 at 18:46

Thursday, Aug 02, 2012 at 18:46
Clean battery terminals.
Check ground connections from battery to engine.
Crook battery???
AnswerID: 492088

Reply By: Paul and Mel - Thursday, Aug 02, 2012 at 19:23

Thursday, Aug 02, 2012 at 19:23
that could be a problem in the cluster itself. remove it and check the plugs on the back of it, it could have dry solder joints on the pins of the circuit board also. the earth to it could be ordinary, maybe locate it in the loom and tee off another and ground it to the body.
AnswerID: 492092

Reply By: Eric Experience - Thursday, Aug 02, 2012 at 19:43

Thursday, Aug 02, 2012 at 19:43
Axle.
The voltage will vary if your voltmeter is fed by the same wire as the blinkers. If you have the voltmeter connected to the ignition circuit. The only way to reduce the effect is to reduce the resistance between the battery and the ignition switch. Toyota tend to use the cheapest possible components. There may not be a problem with the vehicle just an annoying effect. To find out if there is a problem measure the voltage at the battery terminals with the motor running. If it is close to 14.2 you are OK. Eric.
AnswerID: 492096

Reply By: asm00119 - Thursday, Aug 02, 2012 at 21:44

Thursday, Aug 02, 2012 at 21:44
Thanks for the tips. I'll try the connections out and clean them especially the earth. The battery seems good as it keeps its voltage and glows and starts the diesel on a daily basis.
AnswerID: 492112

Reply By: Ozhumvee - Thursday, Aug 02, 2012 at 22:12

Thursday, Aug 02, 2012 at 22:12
Toyota usually puts the blinker can in the charge circuit, first check would be to replace the can as that is usually the culprit.
Peter
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AnswerID: 492119

Reply By: asm00119 - Saturday, Aug 04, 2012 at 19:07

Saturday, Aug 04, 2012 at 19:07
Hmm, the blinker relays you mean? I've done some more trial and error, cleaned ground and checked whether there is any resistance problems on ground. Can't find any.
I found though that when removing the trailer power connector (we're towing a trailer) that suddenly the indicator flashes twice the speed. Reconnecting the trailer it goes back to standard speed. Does that narrow down the issue?

Thanks
AnswerID: 492241

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