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Re: Electrical problems

To:, mgs@Autox.Team.Net
Subject: Re: Electrical problems
Date: Fri, 30 May 1997 20:19:48 -0400 (EDT)
In a message dated 97-05-30 13:37:23 EDT, (Mike
Ellsworth) writes:

> Now back to the turn signal. My right side turn signals still won't blink.
>  I can turn on the signal and it will light steadily....


You have a high resistance somewhere in the right turn signal circuit.
Somewhere, either in the power leads to the switch, in the switch itself, the
wires from the switch to the right hand turn signal bulbs, in the ground
leads from the bulbs, or the bulbs themselves. Check and clean ALL
connections in the above mentioned items. Don't forget the switch itself.
Make sure the switch contacts are clean.

> Could a bad hazard switch be dropping some voltage from one turn signal, so
> flasher doesn't energize? Anyone ever have a similar problem?

Yes. The hazard switch is in the turn signal circuit. Power from the green
circuit to the turn signal switch, via the TS flasher, goes through the
hazard switch. When the hazard switch is on, power is removed from the TS
switch. Power then flows from the purple (or brown) circuit to all four TS
bulbs, via the hazard flasher. If the hazard switch has a high resistance,
neither the LH nor the RH turn signals will work. However, if the hazard
switch has a small resistance, and only the RH side has a high resistance,
the the LH will work, while the RH won't. The hazard switch, then, is not the
only problem, if it is a problem at all. You still have a high resistance in
the RH turn signal circuit.

Of course, there are other, weird, possibilities, but the odds are about 99%
that this is your problem. If the problem occurs when nothing else is on, the
odds go to about 99.99%  Just be sure to check ALL conections.

BTW, you said you replaced the bulbs. Did you get the correct ones? Another
member of this list had the same problem as you are having. In his case, it
turned out he bought bulbs from Radio Shack, under the assurance of the
salesman that they would work. They didn't!  He replaced the bulbs with the
right ones, and the problem went away. Using low wattage bulbs is the same as
having a high resistance in the circuit. Low wattage bulbs have a higer
internal resistance than high wattage bulbs.

Dan Masters,
Alcoa, TN

'71 TR6---------3000mile/year driver, fully restored
'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
'74 MGBGT---3000mile/year driver, original condition
'68 MGBGT---organ donor for the '74

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