1985 toyota coaster dash lights

Submitted: Thursday, Jun 12, 2014 at 20:06
ThreadID: 108226 Views:5141 Replies:5 FollowUps:0
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Hi iv'e got a1985 coaster BB21 3b diesel.the problem i have is the filter light and charge lights remain on,had the alternator tested new brushes all good but dash lights still on.Any tips on what to look at next
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Reply By: Ross M - Thursday, Jun 12, 2014 at 20:39

Thursday, Jun 12, 2014 at 20:39
G'day davross
Does the alternator have an internal or external regulator??

If external, the wiring to the regulator may be faulty/dirty connector or the points in the regulator (which close when the alt is running) may be dirty and the current to turn off the globes is not getting through.

Generally the alternator's output cause the lights to go off and if there is no output despite the new brushes then the lights will stay on.
AnswerID: 534255

Reply By: Ozhumvee - Friday, Jun 13, 2014 at 08:08

Friday, Jun 13, 2014 at 08:08
I think they had an external regulator.
Also if the wiring on the coaster is similar to the same vintage Landcruisers the blinker can is also in the charge circuit.
Also check the fusible links connected to the battery positive in the wiring harness as they eventually fail due to fatigue. Replacements can be made up by buying lengths of fusible link from a good auto electrician.
AnswerID: 534266

Reply By: Member - Stuart P (WA) - Friday, Jun 13, 2014 at 08:18

Friday, Jun 13, 2014 at 08:18
check the power feeds to the regulator there should be ign (white/red)
battery(white/) light(yellow) and of course earth(white /black)
AnswerID: 534267

Reply By: davross - Friday, Jun 13, 2014 at 09:11

Friday, Jun 13, 2014 at 09:11
Hi it has an internal reg, the reg was bench tested OK.so will have a play today on all your suggestions,thanks for the input.stay tuned to this channel for the next episode.
AnswerID: 534272

Reply By: Ron N - Friday, Jun 13, 2014 at 21:02

Friday, Jun 13, 2014 at 21:02
Dave - A faulty diode in the alternator will mean the alternator light will glow dully at all times when the engine is running.

The filter light staying on is possibly a faulty warning switch in the filter assembly.
AnswerID: 534305

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