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  #1  
Old 06-20-2013, 09:20 PM
murdoc rose murdoc rose is offline
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Default What is this relay

I've been doing connection test all day with the same wiring diagram that's on the site. So far only having 2 questions is impressive.

The first being the title. I have a relay mounted on the firewall that to my knowledge does not appear on the diagram. Its next to the hood latch on the passenger side. Any ideas?


The second question has to do with grounding. I thought my 58 was a positive ground car but the diagram suggest otherwise.
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  #2  
Old 06-20-2013, 09:26 PM
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jopizz jopizz is offline
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The relay is most likely the power window relay. Does it look like this. There's a separate diagram for power windows. Squarebirds are negative ground.

John
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Old 06-20-2013, 09:51 PM
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John is on the ball tonight with an excellent picture and he's correct on all counts. The general schematics don't cover accessories like power windows, power seats, convertible top, sequential signals, etc. (if your car has any of these).

1955 was the last year for six volt systems on Ford cars. I have one.

The large box mounted to the firewall is the relay and the small box is a circuit breaker. CAUTION: Yellow wires are UNfused battery power (+12) coming from the starter relay. At the mentioned circuit breaker, overcurrent protected power feeds the relay contacts. The relay coil is energized from the key switch. Sometimes this relay is used to feed the convertible top motor as well.

Important to note; the relay box needs a good ground, much the same as your starter relay, or it won't energize. So, make sure they are tightly bolted down with no rust inhibiting 12 volts.

If you have more questions, please ask. - Dave
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Old 06-20-2013, 10:24 PM
murdoc rose murdoc rose is offline
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Thanks for the fast reply. That is the relay for sure. The negative grounding has me concerned though.
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Old 06-20-2013, 10:43 PM
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Quote:
Originally Posted by murdoc rose View Post
...The negative grounding has me concerned though.
Why? All domestic cars have neg gnd for decades, all the way up to the present. What are your concerns?
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Old 06-20-2013, 11:03 PM
murdoc rose murdoc rose is offline
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My Bendix will kick in and turn the motor while on positive ground but not on negative ground.
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