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Old 05-19-2014, 05:48 PM   #1
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Thermostat

Hello

I have a 1999 pace arrow vision with a 454 and want to put in a new engine thermostat, I got 50 pounds of manuals on this thing and not one tells me what heat range to use. Or if motor homes use a particular type. I think a 190 degree will do but am not sure. anybody have any sure info on this???????

Also my fog lites don't work, I am going to rewire them, the wiring diagrams I have are vague to say the least so I intend to follow the kiss principle and wire them direct but the dash switch assembly has four wires I can't seem to trace out..... why do they make these things so complicated?
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Old 05-19-2014, 06:26 PM   #2
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190* sounds about right. Go to a parts store and ask them to get you the correct one, or remove your old one and take it with you.

For your fog lights, if it's too difficult to trace the wires, rewire it. All you need is the switch (you already have it), a relay, and the wires. Tap off 12v from either ignition or headlights and feed that to the coil side of the relay. Tap the battery for the fog light side of the relay. That should get your headlights shining again.
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Old 05-19-2014, 06:45 PM   #3
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As recommended, either take the old one with or ask at a good auto parts store and they can look it up for you. As to the Fog lights, probably they are wired to shut off when the high beams are on and go off with the ignition, that's perhaps why 4 wires. Also, if the switch is lit, it also could explain the wires.
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Old 05-20-2014, 10:39 AM   #4
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thank you for responding!

my major concern with the thermostat is .....do motor homes (trucks) use a heavier duty unit? most standard auto parts stores usually do not know anything pertaining to M.H.'s I got burned by that once before!

I found a complete fog light installation set up with a relay but I don't need a full set up. what is the reason for a relay being in the set up. I assume the relay prevents voltage to power the lights from passing through the switch. but then isn't voltage passing through the switch to activate the relay?

I noticed the Canadian set up is called DRL and is connected through several items that control the circuit I am not sure which is in my unit, and I cannot identify items used in the DRL circuit. so I assume I have fog lights.
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Old 05-20-2014, 10:53 AM   #5
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The relay is in the circuit because the fog lights draw too much power to handle with a regular switch. The switch activates the relay which has heavier contacts and sends the power to the lights. Same as a horn relay, except a horn relay isn't usually for continuous duty like fog lights.
DRL relates to Daytime Running Lights, a safety requirement in Canada.
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Old 05-21-2014, 07:43 AM   #6
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Thank you!

Additional research explained the DRL and what you say about the relay makes good sense.

I have fog lights and all indications are the relay is toast. I bypassed it and the lights came on but the relay is mounted on a circuit board in the relay box on the front of my unit, I can replace the relay If one is available.
or mount a new one somewhere else, but the wiring will be messy. I prefer working with the circuit board.

Discussing on line here really helps clear out the brain clutter......now to get info on that relay.

Oh! I haven't driven the unit to check my thermostat situation but adding anti freeze made the check engine light go out I will replace the thermostat anyway.
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Old 05-21-2014, 09:35 AM   #7
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Quote:
Originally Posted by donnyman View Post
Thank you!

Additional research explained the DRL and what you say about the relay makes good sense.

I have fog lights and all indications are the relay is toast. I bypassed it and the lights came on but the relay is mounted on a circuit board in the relay box on the front of my unit, I can replace the relay If one is available.
or mount a new one somewhere else, but the wiring will be messy. I prefer working with the circuit board.

Discussing on line here really helps clear out the brain clutter......now to get info on that relay.

Oh! I haven't driven the unit to check my thermostat situation but adding anti freeze made the check engine light go out I will replace the thermostat anyway.
You should be able to tap wires into the CB and use a conventional relay. That sounds like the easiest thing to do. Post pics is you can. You may have a conventional relay that can be replaced.
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Old 05-22-2014, 01:06 PM   #8
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Hello again

Here you go! I found a source for the relays but none here in Austin TX.
I am not keen on ordering things on line but I don't have much of a choice.

It is a Potter @ brumfield tp0s1d12=12

Did someone say Air force! I spent eight years there, Jet engine SPEC.
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Old 05-22-2014, 05:30 PM   #9
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Doesn't look too hard to do. If you don't have one, get you a solder sucker to make it easier.

I was in for avionics/sensors. AFSC 455X
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